>> tonight ofrontline... >> there is an incredible fascination with forensic science. we are up there now with sex, motherhood, apple pie and baseball. >> forensic science is everywhere. >> it's a match. >> on tv... >> it's a match. >> it's a match. >> it is used to arrest... >> now i'm scared. they had me handcuffed. >> and to convict. >> they charged me with capital murder. >> but what we thought was science may not be. >> we are using techniques that have never been validated scientifically. >> like the science of fingerprints. >> no two people have the same fingerprint. that's the scientific premise. is that true? >> i thought so.

>> in the casey anthony trial... >> in fact there is no nationl standard for any forensic testimony. >> the judge allowed in the smell test when it comes to death? >> and it had never been allowed in a court. >> and what about getting certified in forensics? you can do that online. >> if you want a certificate that says you are certified in forensics, this is the place to go to. >> tonight ofrontline, correspondent lowell bergman joins with propublica in an investigation of one of the increasingly controversial tools of the criminal justice system: forensic science. >> there is something that people need to understand about bad expert witness testimony and bad science: it doesn't just put innocent people in jail, it leaves murderers on the street. frontline is made possible by contributions to your pbs station from viewers like you.

and by the corporation for public broadcasting. major support for frontline is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant and peaceful world. more information is available at macfound.org. additional funding is provided by the park foundation, dedicated to heightening public awareness of critical issues. and by tfrontline journalism fund, with a grant from millicent bell, through the millicent and eugene bell foundation. >> bergmacsi is the most watched drama series in the world, brimming with flash and glamour, where cutting-edge forensic technology always

reveals the truth. (siren wailing) but crime scene investigations in the real world are rarely so simple. >> (on radio): go ahead. >> county 51, can you advise the tow yard that's housing the 187 vehicle from the ninth? case number 275. >> 10-4, you there? >> negative. i need to know so i can... >> 10-4, give me just a momen. i'm finishing up with a spanish interpreter. >> bergman: detective joanna grivetti leads the crime scene investigation unit for the police department in richmond, california, one of the most dangerous cities in america. >> everyone thinks that when you tell them that you're a csi, that you're like what they see on tv. the real csi is dealing with blood, getting dirty underneath a car, smelling things that you don't want to smell, seeing things that you don't want to see. you see the worst that humans are capable of

doing to one another. there's evidence that needs to be collected, documented, processed. it's about taking the time to find the small things that are going to wind up being a big thing down the road. >> bergman: things like fingerprints-- one of the most widely used of all forensic techniques. for over a century, fingerprints have been used to identify criminals, from petty thieves to international terrorists. (explosion, people shouting) (second explosion, screaming) (third explosion) in 2004, a series of explosions in the subways of madrid killed or injured nearly 2,000 people. when the dust settled, the spanish authorities found several partial fingerprints on a bag of detonators.

>> now, at the time, the spanish national police did not identify anybody to those prints, so they sent the prints to interpol, who then forwarded them to the fbi. >> bergman: melissa gische is a fingerprint expert at the legendary fbi laboratory in quantico, virginia. >> the examiner analyzed the prints. he ran them through the system. >> and in this case, the examiner found a match. >> yes, in this case the examiner effected an identification. >> bergman: the fbi's identification led them to a suburb of portland, oregon, where a young attorney was working in his office. >> i got an unexpected knock on the door. i cracked the door open and there was two individuals, a man and a woman, and they identified themselves quickly that they were fbi agents. >> bergman: the fbi examiner determined that this fingerprint found in madrid matched a print taken from brandon mayfield when

he was in the military. >> they proceeded to push through rather forcefully, to handcuff me. it was just unbelievable. it was surreal. i mean one minute you're sitting there and you've taken your kids to school and you've said, "have a good day and be a learning superstar," and you're working on your case in your office, and the next minute you're heading downtown in cuffs and people are searching you for blasting caps and detonators. >> bergman: for generations, the fbi and their fingerprint examiners have maintained that fingerprint identification is "infallible." routinely testifying that they are "one hundred percent certain"... and there's "zero percent" chance they could be wrong. >> fingerprint examiners have been taught that there's only one person in the world who could have left this fingerprint. there's no scientific basis for that. >> wait a second. there's no scientific basis for matching, like a partial

fingerprint? >> the premise is that no two people have the same fingerprint. that's the scientific premise. is that true? >> i thought so. >> has there ever been a scientific study to demonstrate that that is true? i don't think so. but even more important, how much alike do they have to be before you say that that fingerprint came from this person? what is the standard for how many points of comparison? >> what is the standard, judge? >> it varies from laboratory to laboratory and from witness to witness, often. and some will say, "we need 16 points." "no, seven." and what they all end up saying is that it's really a matter of the individual experience and judgment of the fingerprint examiner. >> bergman: to make an identification, the fingerprint

collected at the crime scene is examined for unique characteristics like ridges, loops and whorls. those points are then compared with a known print. once the examiner believes there are enough points of similarity, he declares it a match. >> welcome to forensic identification. paper's a very good object to get prints from-- letters, bags... >> bergman: ken moses is a veteran fingerprint examiner who has investigated more than 17,000 crime scenes in his 40-year career. >> i can see a lot of detail on those prints. >> when you're looking at this partial print versus the known print, when do you decide that it's a match? how do you decide it's a match? >> at some point, you are examining this evidence, and based on your training and experience, you make a leap of faith.

>> you make a leap of faith? >> it's a point of decision making. it's where you go from doubt to no doubt. that's a leap of faith. >> bergman: after mayfield was identified, the fbi learned he was a muslim, active in his community, which he maintains led to his arrest. mayfield insisted he was not a terrorist and had never been to spain. the only evidence against him was that partial fingerprint. but at the fbi laboratory in quantico, the print was matched by a second examiner and then confirmed by the head of the fbi's fingerprint unit. >> so three examiners would say that this was brandon mayfield's fingerprint. >> in this case they did, yes. >> and i believe they provided an affidavit saying it was 100%. >> that is how they did testify, in that manner, yes. >> (on radio): a portland, oregon, man has been arrested by fbi agents. >> officials are detaining

mayfield in the county jail. >> mayfield's fingerprint was found on a plastic bag with bomb-related materials. >> he could be held indefinitely. >> it was a nightmare. you know, when you're there in your jail cell, alone, and you're just faced with your... your own thoughts. that's when the gravity of the situation really sunk in. >> okay, so you're in the lockup, they say that you're a 100% match. your lawyers get a fingerprint examiner, right? >> yes. the one hope was that this fingerprint examiner would straighten it all out and wouldn't agree with these other three examiners who'd said this is a 100% conclusive match. >> i received a call from portland-- a request which i get many times a week, to take a look at a print. >> bergman: ken moses was selected as the independent expert in the mayfield case. >> i didn't know what finger they had identified. so i had ten possibilities. so i started with the thumb, went to the index, went to the

middle. no, no, no, no, no, no, boom. i come up with one, ah! here is one with a couple of similarities, a couple of more, a couple of more. by the time i got to 15, i said, "this looks like an identification." >> so then you got on the phone with the court, right? >> that's right. >> and you testified. and what did you tell them on the phone? >> i said, "i've examined the known print and concluded that the fingerprint is a positive match." that's what i told them. >> he actually confirmed what the other three examiners had said. and from that point on, i kind of felt like the train to a death penalty had just pulled out of the station. >> bergman: mayfield says his own lawyers assumed that the print was his. two weeks into his detention, he had to decide whether he would

testify or exercise his right to remain silent. >> i was going to go to the hearing and tell the judge what it was i was going to do. i was either going to testify or not talk. and, um... you have to excuse me, because it was difficult. i waited and i waited and my attorney showed up, and he said, "brandon," he said, "we just learned, we just learned it ourselves, that the spanish police had identified this latent fingerprint as belonging to an algerian." and i looked at him and i said, you know, like, "see? i told you. i told you it wasn't me." >> when you heard that it wasn't him, what did you think?

>> well, i knew that our profession had taken some sort of a quantum leap, because suddenly there were new rules involved. no time before in history had there ever been two fingerprints with 15 minutiae that were not the same person. under our past standards, i was right. but i was wrong. i had made an error. and so had every other examiner that looked at the print. so therefore, when i heard that it was an error, i knew the ground had shifted somewhere and indeed it had. >> we've been using this for a hundred years. we ought to have some serious amounts of science to support the claims that examiners make. >> bergman: jennifer mnookin, a law professor at ucla, is heading a study funded by the justice department on fingerprint identification. >> what matters here isn't, "are your fingerprints really different from that guy over there?"

the real question is, "is some part of your fingerprint sufficiently similar to some part of his that a competent examiner might mistake some part of your print for a part of somebody else's print?" well, that's exactly what happened with brandon mayfield. >> bergman: there had been other mistakes in the past, but the mayfield case highlighted the weak link in fingerprint identification: the examiner. >> running both prints through... >> bergman: unlike fingerprint analysis on television, machines do not make a match-- people do. >> the examiner is the instrument of analysis. there is no objective criteria. it's a subjective judgment of the fingerprint examiner. >> bergman: dr. itiel dror, a cognitive neuroscientist based in london, is one

of the world's leading authorities on fingerprint analysis. he says that examiners can be influenced by bias. >> we're talking about bias that's unconscious? >> absolutely. >> we're not talking about a conscious conspiracy to match up the suspect with the fingerprint. >> absolutely, we're talking about dedicated, hard-working, honest, competent forensic examiners. >> bergman: dr. dror says this is cognitive bias. and in a study to show how strong that bias can be, he took real cases-- where examiners had found a match-- changed the descriptions of the crime and then asked the same examiners to analyze them again. >> i gave the same prints to the same examiner without their knowledge, and a large majority of the examiners said now it's not a match. >> so, in over half the cases, they would disagree with their former opinion?

>> yes, it changed their perception and judgment, and over half said it is not a match. >> in the study that dr. dror did, the examiners changed their mind. over half of them. >> four out of five. >> same data, same examiner... same examiner. >> right. >> completely different result. how can that be a science? >> well, there's going to be, i think, variability any time there's a human involved in the process. >> so it sounds like you agree with dr. dror when he's talking about cognitive bias. >> if you're asking me if i think that there is the potential for cognitive bias to come into play in a fingerprint examination process, i would say yes. >> bergman: after nearly a century of insisting-- in and out of court-- that fingerprint analysis is infallible, the fbi has now changed the way it testifies. >> today, particularly since the mayfield case, you don't testify the way you used to testify, right?

>> right. i certainly wouldn't say "100% certain" or "zero error rate." i would want to explain any of those things if i was asked about them. >> so, there is no infallibility here. >> i would not testify to that, no. >> i think fingerprint evidence is accepted in the united states. i think it is a rare case when they get it wrong. and, you know, the critics can scream all they want, but, uh, it's-it's a very vital part of our criminal justice system. he didn't go to jail or anything, all right? >> bergman: scott burns is the director of the national district attorneys association, which represents state and local prosecutors, who handle the vast majority of criminal cases. >> nobody ever asked me about the hundreds of thousands of cases every year where it does work and where good forensic scientists testify. we get it right most of the time. the mayfield case is the anomaly. it is the rare exception. and to hold that up as somehow representative of what goes on

in courtrooms across america is just wrong. >> what is an anomaly is that they found out. not that they made a mistake. how can he say that you get it right most of the time? how did he know that it's not the tip of the iceberg? to say that mayfield is an anomaly in a single case is naive at best. >> the courts had been misled for a long time, because we had been told, my colleagues and i, by some experts from the fbi that fingerprint comparisons involved essentially a zero error rate, without our ever understanding that's completely inaccurate. >> bergman: harry t. edwards is a federal judge on the u.s. court of appeals for the district of columbia. he's an authority on the forensic sciences. we caught up with him in new york, where he agreed to an exclusive interview. >> the national district attorneys association and some

of the more prominent fingerprint examiners that we've talked to, they're saying things were fine, are fine, and fingerprints have worked fine in court for decades, if not a century. >> if some people are saying it works because we've gotten convictions, that is to say nothing more than juries and judges have believed that experts knew what they were talking about, and so they bought it and they convicted. that's not proof that the discipline is undergirded by serious science. >> well, they say it's based on practice, it's based on years of experience, it's based on... that's valid, isn't it, your honor? >> no, no, of course not. if your experience or practice has been inaccurate or wrong for many years, it doesn't become better because it's many years. it's just many years of doing it incorrectly. and the stakes are too high. when you're talking about prosecution, incarceration, the stakes are too high. >> can you advise the 1020 on the 187...

>> bergman: in richmond, california, detective grivetti is called to a homicide, the third shooting of the day. >> the coroner just arrived. (woman wailing) >> what wakes me up in the middle of the night is the wail of a mother when they find out that their child has been killed. and it's that sound, not only does it keep me up at night, it's what drives me to make sure that i don't hear it again. i want to find justice for these people. they deserve justice, their family deserves justice. >> pretty sure there is a bullet in the tire somewhere. >> yeah, i got it! >> got it? >> oh yeah. beautiful. >> oh look at that, oh wow! obviously a hollow point bullet, and what's important is the characteristics that are left on that copper jacketing. it has the markings. hopefully we can find something that will help us link that

bullet to that gun. evidence is extremely important in any investigation. it's going to help figure out what happened, how it happened, possibly why it happened. and it puts people in jail, it gets people out of jail. >> bergman: grivetti, and thousands of forensic investigators around the country, collect the evidence that is relied on to catch criminals. but questions are being raised about the scientific validity of some of the techniques they use. in an unprecedented report, the national academy of sciences concluded that many forensic sciences: "have never been exposed to stringent scientific scrutiny." and "do not meet the fundamental requirements of science." in addition to fingerprints, this includes analyzing blood spatter, matching hair and fibers.

or ballistic analysis, the matching of marks on a bullet casing to a gun. >> i think i, and probably many of my colleagues, assumed that the forensic disciplines were based on solid scientific methodology, and were valid and reliable. >> bergman: judge edwards was a primary author of the national academy of sciences report. >> when you saw forensic science, did you have any reason to question it? >> no. you assumed that the work in putting the evidence together and in offering the testimony was proper. there could be mistakes, and you understood there could be challenges, but you didn't assume what we later uncovered, which was that there were systemic serious problems with respect to certain of the disciplines. >> bergman: one of the disciplines the report found to be among the most controversial was bite mark analysis, which produced a "high percentage of false positives."

in the small town of brooksville, mississippi, a series of brutal murders tested the limits of this controversial forensic technique. levon brooks remembers a day in september 1990 like it was yesterday. >> my brother came and told me, said, "police looking for you." and i said, "for what?" and he said, "i don't know, they didn't tell me nothing." and i said, "i'm going to go down to the county jail and see what they want with me." >> bergman: a three-year-old girl had been abducted, sexually assaulted, murdered and dumped in a pond. brooks was the ex-boyfriend of the girl's mother, and the police wanted to talk to him. >> they kept me, like, for 72 hours for questioning in the investigation, so i ain't had no problem with that.

so then they said they want to do a dental impression on me, and i said, "okay, fine." >> bergman: a pathologist, dr. steven hayne, conducted the girl's autopsy. he suspected there were bite marks on her wrist. and he recommended that this man, michael west, a forensic dentist, examine her. >> they ran a dental impression on me, and then like a week later, my lawyer came to me and told me, said, "we got a little bad news." i said, "what you mean?" he said, "the bite marks on the little girl matched yours." i said, "man, how can i bite somebody and i wasn't even there?" he said, "well, that's what they came up with." >> bergman: brooks said he was working at a bar filled with customers when the crime occurred. but during the trial, the bite marks, the only physical evidence linking brooks to the crime, trumped the defense's

eyewitness testimony. >> they charged me with capital murder. i couldn't even believe that. i couldn't even believe it. >> bergman: levon brooks was sentenced to life in prison. >> i felt like my life was over with. my mother told me, she said, "i know you didn't do that, but i want you to hold your head up and god gonna bring you out." and i know god know, and my family know, that i hadn't did nothing. >> bergman: while brooks was serving his time, another three-year-old girl was abducted, sexually assaulted and murdered. her body was found in a nearby stream. her autopsy was also performed by dr. steven hayne, who was called to testify about his findings. with an eerie similarity to the earlier case, dr. hayne

testified that he saw what he believed to be bite marks on the girl's body. and the forensic dentist, michael west, testified that those bite marks came from this man, kennedy brewer, the boyfriend of the girl's mother. brewer was convicted and sent to the mississippi state penitentiary to be executed. >> there have been a number of people who were convicted based on bite mark testimony, who were sent to death row or sent to prison for life, and in each of those cases, a whole group of forensic odontologists, forensic dentists, said they were absolutely certain that this was the guy, and they were absolutely wrong. >> bergman: peter neufeld, who represented both brooks and brewer, is a founder of the innocence project, which has helped free hundreds of people who were

wrongfully convicted. neufeld says that most of those convictions involved the use of what he calls "invalid" science. >> invalid science meaning it has no basis in fact? >> yeah, like the person who looks at, uh, uh, scratch marks on someone's hand and says, "those are human bite marks that came from that man to the exclusion of everybody else on the planet." there is no science to support that conclusion, period. it's something made up by... >> but the judge allowed that in. >> the judge allowed it again and again and again. frankly, not just one judge, but judges all over the country allowed that testimony, because it came in from guys in white lab coats. >> bergman: there is one forensic science that everyone agrees is valid: dna. unlike many of the forensic sciences which were developed by law enforcement, dna analysis was developed by medical science and has been subjected to decades of rigorous scrutiny. >> dna is the principal example

of real science at work. dna really is the only discipline among the forensic disciplines that consistently produces results that you can rely on with a fair level of confidence. >> when we looked at all the cases of people who have been exonerated by dna evidence, we found that in 60% of those cases, experts who testified for the prosecution produced either invalid evidence or the misapplication of science in their testimony. >> bergman: in other words, dna has called into question the basic reliability of many of the other forensic sciences. >> what we're talking about with forensic science is systemic failure. we're talking about using techniques, using equipment that's never been validated scientifically. >> bergman: but police and prosecutors say they need to use every tool they can get. and sometimes that means pushing the boundaries of forensic science, even in the most

high profile cases. >> (on phone): 9-1-1, what's your emergency? >> bergman: in orlando, florida, a series of calls to 9-1-1 led to a sensational murder trial that captivated the nation. >> the 25-year-old accused of killing her two-year-old daughter... >> bergman: casey anthony was charged with the murder of her young daughter. the case against her began with an admission she made to the 9-1-1 operator. >> bergman: to many it seemed clear that anthony was guilty, a view reinforced by the media. >> ...she let the child go

unreported, based on those pictures of her slutting it up during the time she claims she was searching for her child... >> bergman: the skeletal remains of casey anthony's daughter were found a block-and-a-half from her home. the prosecution had no eyewitnesses, no murder weapon and no cause of death. what they did have was a theory that emerged after the 9-1-1 call. >> bergman: based in large part on that smell and her disturbing behavior, the prosecution set out to prove that casey anthony killed her daughter and hid the body in the trunk of her car. they sought the death penalty. jeff ashton was on the prosecution team in charge of the forensic evidence. >> so what we have here... >> bergman: twenty years ago, ashton was the first prosecutor in the united states to get a conviction based on dna.

now he wanted to use a new forensic method to convince the jury that the smell in the trunk of that car was the "smell of death." >> you can actually kind of detect it a little bit still, to this day. >> explain to us the introduction of the smell of death. >> the odor analysis. >> right. >> we had the trunk of a car, which was described by a number of lay witnesses as having an odor that was distinctly identifiable as human decomposition. i smelled it myself. and i can tell you, having smelled it over my career many, many times, it's very recognizable. i noticed it. this sort of sat in the middle of the trunk... there was a stained area on the carpet that appeared to be the source of the odor, and that piece of carpet was sent in a sealed condition to dr. vass. >> bergman: dr. arpad vass is a forensic anthropologist at oak ridge national laboratory. he has been studying human decomposition at the university of tennessee's "body farm," under grants from the federal government.

the prosecution called dr. vass to testify as an expert on the odor of the dead. he analyzed an air sample from the trunk of casey anthony's car that had been sealed in a can. >> when you first opened it, what was your reaction? >> well, the odor was extremely, overwhelmingly strong. >> and what did you recognize that odor to be? >> i recognized it as human decompositional odor. >> that you've smelled many, many times before... >> 20 years' worth. >> dr. vass's 20 years of research have all been in the biochemistry of decomposition, attempting to isolate those compounds that are unique to human decomposition. and what he said was that the odor that was chemically analyzed from the trunk was consistent with human decomposition. >> okay, but you agree this was on-the-edge science. >> this was cutting-edge forensic science, and it was

cutting-edge for lawyers and judges. >> never introduced before. >> never introduced before. >> the trial judge allowed this into that courtroom without there being any quality assurance controls, without there being any error-rate studies. and yet, he let this go to the jury. and quite frankly, in my opinion, it was an outrage. >> do you have an opinion as to whether it was a decomposing human body in the trunk of that car at some point? >> i do have an opinion. >> and what is that opinion? >> i can find no other plausible explanation other than that to explain all the results we found. >> whether that opinion is right, is wrong, is garbage, is up to a jury to decide. >> you have made it clear that this has not been studied. >> bergman: jose baez was casey anthony's defense attorney. he attacked the ability of dr. vass to scientifically identify the smell of death. >> his opinion was, "you just have to trust me." and i don't think that that's

acceptable for a courtroom. but you're willing to come to this jury... unless you can clearly show that a prosecution is presenting evidence that is faulty, you're running into a danger zone. let's say, for example, the prosecution presents one witness that says something, and they're relying on an expert, and the defense puts their own expert to explain that it's junk science. who are you going to believe? >> i think it's a little bit naïve to think that the adversarial system will have smart lawyers on both sides, and they'll duke it out, and we'll figure out the right answer. we need the science first, and then let them fight about what the good science means, as opposed to struggling with disciplines that don't have good science undergirding them. >> lawyers are scientifically illiterate, judges are scientifically illiterate, and certainly juries are.

so there has to be a fix upstream to make sure that before any evidence gets to a court of law, that it is be... that it has been validated, that it is reliable, that it does meet national standards, and that we can all have confidence in the... uh, in the result. >> one of your favorite protagonists, peter neufeld, says, "lawyers are scientifically illiterate. judges are scientifically illiterate. so there has to be a fix upstream before any evidence gets into a court of law." >> no, i just have to disagree. for mr. neufeld to say, "well, lawyers are stupid and judges are stupid, so we shouldn't admit this evidence," uh, is stupid. that's ridiculous. it really is. when you bring a piece of evidence into a court of law, good women and good men that are trained as judges weigh the evidence, juries can look people in the eye, and they can determine whether or not they trust it.

and that's our system. >> neither casey anthony nor caylee anthony can be excluded as the source of that q12.1 hair. >> bergman: in the casey anthony case, 37 expert witnesses testified in over a dozen forensic disciplines. >> the group of insects that we found... >> bergman: the defense team challenged many of them, something jose baez says he would not have been able to do in most criminal cases. do you normally have the resources to challenge forensic evidence when it comes into court? >> 95% to 99%, no. >> you don't have the money to hire your own experts? >> hardly ever. >> so casey anthony was an anomaly? >> she was. >> because? >> well, she had photographs of her and her child, and a network paid us $200,000 so we could mount a proper defense. and that's exactly what we used the money for. >> abc news? >> yes. >> paid $200,000 for the

photographs? >> correct. >> and that's what paid for her defense? >> partially, yes. >> at the moment now, inside of a courtroom in florida... >> the case against casey back in the courtroom. >> casey's bizarre behavior... >> bergman: the trial of casey anthony dominated television news for months. america seemed enthralled by the forensic testimony. >> when you have skeletonized remains... >> bergman: one of the networks' "go-to experts" was dr. cyril wecht, considered by many to be among the top forensic scientists in the country. >> there is the great, great hunger, this incredible fascination with forensic science. i often quip that we are up there now with sex, motherhood, apple pie and baseball. i think we are in the top ten, forensic science. >> bergman: for many years the elected coroner in pittsburgh, pennsylvania, dr. wecht has been a controversial character, and

something of a local folk hero. >> you're just as handsome as ever. >> thank you. that just cost me $25. >> a lot of people are familiar with the casey anthony case. >> yes. >> which was filled with forensic testimony. >> yes. >> right, of all kinds... >> yes. >> ...that was allowed in. >> yeah, by experts. >> by alleged experts. >> well, you say alleged. i'm not... to my knowledge, everybody who testified were all board-certified people. >> well, not the gentleman who testified about... >> the smell? >> the smell. there is no board in smellology. >> yeah, but the gentleman who testified about the odor, he works on the body farm. i mean, he's been there for years. he's dealing with these decomposing, smelly bodies every day in his professional life. if he's not qualified to express an opinion on what a body smells like that is decomposing, then who in the world is? >> bergman: experts are supposed

to be qualified based on their knowledge, skill, experience, training or education. whether they can testify or not is up to a judge. if i understand the law correctly, once you, the judge, say that someone is an expert and they get into court, that's it. they're an expert. >> they're an expert. >> is there a system for monitoring expert witnesses? >> no, none that i know of. the only system we have is an expert who happens to come back before the same judge, but there's not even a way of getting information from one case to another. >> as i understand it, there's no national organization that you could go to to say, "is this expert... what's their track record?" >> no, there's no national organization for that at all. >> for any of the forensic sciences? >> as far as i know. i've heard it said that there's more licensing requirements for

your hairdresser than for forensic scientists. >> when someone comes before you, the kind of credential they may present... is that important to you? >> one thing that we judges do sometimes is look for shortcuts. and credentials are often appealing shortcuts. it's convenient for a judge to say, "this proposed expert has been credentialed by the sump-tee-ump society." but it has an inordinate impact on jurors because jurors have no way of knowing whether this certifying body exacts scientific standards or is just a diploma mill. >> you're doing autopsies, you're talking to lawyers, prosecutors, and what else are you doing? >> bergman: there are all kinds of forensic science organizations. some have the highest standards. dr. wecht is the chairman of the executive advisory board and chief spokesman for one of the largest forensic credentialing organizations in the country: the american college of forensic

examiners international, acfei. they offer over a dozen credentials, like "certified forensic consultant," "certified medical investigator," and "certified forensic physician." but the national academy of sciences report, which recommends mandatory certification of forensic experts, states that some certifying organizations "appear to lack stringent requirements." it cites articles about acfei from 1999 and 2000, in which critics called it "a certification mill." at the university of california berkeley, a graduate student in the investigative reporting program, leah bartos, was assigned to find out what it takes to become certified by the acfei. for $660, she became a member and took an entry-level course

for expert witnesses. a few videos and a study packet were provided to prepare for the test. >> it was like an open book exam, basically. and i passed. >> bergman: she sent in her bachelor's degree, resume and references, and two hours later, she was certified. >> i got an e-mail back that said, "great, thank you so much, you can now start using your certified forensic consultant designation, and your diploma will be in the mail." >> my graduate student took the test and applied... >> what is her field? >> she's a masters in journalism. >> okay. >> she has no forensic background. >> but she's interested. >> well, we wanted to find out what it took to join the organization. there was a lot of criticism of the organization in general, even though it appears to be the largest membership organization of its kind. >> that's right. the purpose of the organization is to encourage people who are interested in forensic science to learn more, to study more.

>> do you have any idea what percentage of people pass your exam, the exam that you helped put together? >> no, i don't. >> do you know how many people took your exam? >> no, i don't. i don't know what goes on administratively. >> bergman: we went to acfei's headquarters here in springfield, missouri, to speak directly with the organization's founder and president, robert o'block. o'block is a staunch defender of the company's reputation. in the last year alone, he's filed five defamation suits. o'block let us film him in his office and spoke to us at length off-camera, strenuously denying that acfei is a diploma mill. he pointed to many prominent forensic scientists who are members, and stressed that the primary purpose of the organization is educational. we asked for percentages of how many people pass their tests, but were never given the numbers. in the end, o'block declined

an on-camera interview. in washington, d.c., we met with acfei's former president and ceo, john bridges. initially, what did you think the organization did or was doing? >> i thought they would advance the practice... >> bergman: bridges was in charge of acfei when leah bartos became a member of the organization. he quit soon after because, he says, he could not change the way the organization does business. you were cautioned by people who knew you. what did they tell you? >> i think the assessment of the organization is that it's looked at as a certification mill-- that if you send in a check, you will receive a certificate. i think the focus was primarily on revenue versus professionalism. >> money was more important than the quality of what was going on. >> i think that's a way to sum it up, correct. >> we asked for the failure rate on the tests. we didn't get an answer.

>> i would say the failure rate is probably less than one percent. so if you want a certificate that says you are certified in forensics, this is the place to go to. >> we spoke with someone who is knowledgeable about what goes on inside the organization and how many people pass not just this test, but all of the tests that are administered. and this person says 99% of the people who apply, as long as their check doesn't bounce, get a certificate. >> well, i think that that is inordinately high and should not be. i readily, readily state that without hesitation. there can be no meaningful exam that has a 99% pass rate. >> amongst the materials it says, "the certified forensic consultant designation contributes to the weight of testimony and the relevance of the evidence to the issues in the case." >> okay. >> okay? >> there's nothing wrong with that language. >> but she has no expertise.

>> the key word is "contributes to." "contributes to." that is the controlling word, "contributes to." and any good lawyer, a kid right out of law school, would say, "ma'am, just exactly what is your training?" and the point i'm making, you see, is that that piece of paper doesn't mean very much. it's... i'm sure it's designed to make somebody feel good, to make them feel that they have accomplished something. >> is it just resume padding that's going on here? >> i think it's semantical embellishment. >> semantical embellishment? >> you like that? you like that? >> tt's a good one. >> i like that, too. i just thought of it. but listen, i would not argue with you if you said, "maybe words should be changed and instead of 'certified' you think of something else." but does it really qualify them to be the expert in a particular field? no.

>> that was not what was expressed to me while i worked there. >> bergman: linda duncan was the finance director of acfei until late 2010. >> in fact, some of the documentation would state that this is a way to certify you as an expert in your field. it kind of astounds me that cyril wecht would say that when that's kind of the purpose of the company. >> that's what they said. >> mm-hmm. that's what i was told. >> that it was for expert testimony. >> mm-hmm. i was told that... >> who told you? >> it would have been dr. o'block himself. said that the intention was to certify these individuals to be experts, to show them as experts in their field, so that they may testify in court. >> dr. wecht says-- and his name is on their diplomas-- that this certification will contribute to your credibility and your testimony. but it doesn't say that you are an expert. >> but the judges use it to be... to make you an expert.

the juries use you to make an expert. so that's a fallacy. >> so why would dr. wecht say, "these are just for people to put up on their wall, it doesn't mean that they're really experts"? >> if that's the case, then there should be a memo from that organization that goes out to all the judges saying, "don't consider this certification when you consider whether this person should testify in a particular area." and unless that goes out, how are the judges to know? how is the jury to know? >> there's really no way to tell today what the certifications mean. there's no standard for that. >> there are certifiers, but not what you and i are talking about-- that is, real licensing programs, real certification programs that train, give serious tests, and will revoke your license and affect your job and ability to testify in the event that you do something wrong or fail. no. that doesn't exist now. >> we need a body that is regulated, that can say, "these

are the scientifically based professionals who are qualified to be experts." the minute we leave that open to for-profit groups who make money from issuing pieces of paper, we really undermine the public's interest and the public's legitimate interest in making sure that we've got a scientific basis for sending somebody to jail. >> bergman: in mississippi, peter neufeld and the innocence project used dna testing to ultimately exonerate levon brooks and kennedy brewer. each man had spent over a dozen years in prison. >> you are hereby discharged. you are free to go. >> they put me on death row, but i just kept my faith that i'd get out one day. >> bergman: the real killer was caught and confessed to both crimes, although he denied biting either victim.

on that same day, levon brooks was set free. >> he told me, "mr. brooks, all your charges been dismissed, you're free to go." that was exciting, like, "ooh." it felt so good. and forensic experts, like dr. west and hayne, they should not never be able to practice no more med... no nothing, in this state, in no kind of state, because of what they did to us, and maybe other people. >> bergman: citing ongoing lawsuits, doctors hayne and west declined to be interviewed. in 2008, the innocence project wrote to the mississippi state medical board, stating that dr. hayne is "a danger to the public" and should not be allowed to testify. dr. hayne is suing the innocence project for defamation. the case is expected to go to trial later this year. meanwhile, he continues

to testify. among the various qualifications he cites is a certificate from acfei. >> there she is, guys, we got her, you can see her, she is coming out the front door right here. unbelievable... >> bergman: after 33 days of testimony, the defense prevailed. casey anthony was found not guilty of murder and released. >> this case utilized every single type of forensic science. they threw a bunch of stuff against the wall and they were hoping something would stick, and none of it did. you would think that there would be higher standards when someone's life is on the line. >> 99% of the time, forensic evidence is reliable and accurate and very, very necessary. and to take a small number of

cases or the opinions of a few people and take that as an indictment of the system of forensic science does a disservice to not only forensic science but to justice. >> do mistakes occur? yes, they do, and it is unfortunate. but crime scene investigation is relatively new. it's an evolving science. if we don't have the techniques and the tools and the knowledge to move forward, then we can't serve those that need our help. >> we have to know that the experts who are testifying know what they're talking about and that the disciplines that they are representing are supported by validity and reliability. we have to know that. the american people ought to understand and worry about the problems that we've found and do something to correct them. it is not pro-defense, it's not pro-prosecution,

it's pro-justice. >> next timfrontline... >> assisted living is the rock we don't want to look under. >> an exclusive report on a multibillion-dollar business. >> the head of a state licensing agency told me, they know there's a problem, but they don't have the resources. >> frontline and propublica reporter a.c. thompson investigate. >> did you worry, "i could do something that leads to somebody's death?" >> all the time. >> frontline continues online. learn more about eight common forensic analysis tools. explore more about the controversial forensic evidence presented at the casey anthony trial. >> i smelled it myself. >> read more from judge harry edwards, author of the national academy of sciences report

on forensic science. >> we need the science first. >> and from acfei spokesman dr. cyril wecht. watch the full program again online, and follfrontline on facebook and twitter, or tell us what you think at: frontline is made possible by contributions to your pbs station from viewers like you. and by the corporation for public broadcasting. major support for frontline is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant and peaceful world. more information is available at macfound.org. additional funding is provided by the park foundation, dedicated to heightening public awareness of critical issues. and by tfrontline journalism fund, with a grant from millicent bell, through the millicent and eugene bell foundation.

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>> narrator: the images flash across our screens, and we wonder what compels a human being to commit the most inhuman of crimes? >> the school is in lockdown. >> narrator: in the wake of newtown, nova investigates the roots of violence. are killers born or made? are mass murders driven by an urge to kill or a wish to die? so he was really going through hell? >> yes, he was being tormented by his friends. he was a new kid at a big school. >> this sense of frustration and hopelessness grows in them. >> narrator: neuroscience examines the causes of violent behavior and the key ingredients in creating a killer >> we know the factors that can put a child at risk for acting aggressive and violently. the kids who typically do these rampages show many of the same factors. >> these were very important behaviors, they are te