>> it really makes me concerned. i think that we have an obligation to the public to keep us safe. and the dogs we know are the most effective screening tool for explosives. >> reporter: recently the doctor warned congress of the potential for a looming shortage. >> one of the major reasons for the shortage of quality dogs we rely heavily on procurement of dogs from other countries. a national breeding program is a priority. >> reporter: transportation security administration used to have its own breeding program

but shut it down in 2012 due to high cost. now the agency says it needs some 60 dogs to add to the more than 300 it is using. customs and border protection says it needs an additional 325 canine teams. >> we really need to think about a better way to provide these dogs. because the it really is a national security issue that we are all invested in. >> the tsa says it would look to add hundreds of more detection canines to airports in the coming years. kris van cleave, cbs news, reagan national airport, virginia. addict tugs opioids including painkillers and heroin takes more than 29,000 american lives each year. a new treatment for addicts using implants should be available by the end of next month. anna werner take is a look. >> i wok up every day. my focus on life was to find a way to have, get oxycontin to function throughout the day. >> reporter: 39-year-old chris

borgioni got hooked on painkiller after breaking his hip in 2003, battled addict forcing five years before hitting rock bottom. >> i knew if i've continued on the path i would eventually die. >> reporter: he checked into a clink where they gave him a pill used to wean addicts off opiates. but he would forget to take the medication and eventually relapsed. it was then his doctor enrolled borgioni in a clinical trial for a new treatment for opioid dependence. here is how it works. four one inch rods the size of a match stick are implanted into the upper arm. over a six month period, the rods release the drug into the blood stream which then travels to the brain. there it latches on to receptors that are usually triggered by prescription pain pills or heroin, blocking the craving to get high. dr. richard rosenthal of mount sinai hospital oversaw the clinical trials. what excited you the most about this new development?

>> new weapon in our armament to fight drug addiction. the risk for relapse is reduced because you are not going to miss a dose. always going to have your new opioid receptors covered by the medication. >> with the implants it will give me the opportunity to, to just live a normal life without feeling the need to take a pill every day. i am hoping that by doing so, at the end of the treatment, i will be able to move forward without any medication whatsoever. >> reporter: dr. rosen thol says the new treatment could eventually be used to help some 500,000 people currently addicted to opiates. the drug's cost is estimated at $6,000 every six months. >> anna werner, reporting, thank you. > outrage grows after a gorilla is killed to protect the life of a young boy. the fallen. the "cbs ove poor mouth breather. allergies? stuffy nose? can't sleep? take that. a breathe right nasal strip instantly opens your nose

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today the director of the cincinnati zoo said officials have no choice but to kill a gorilla after a 4-year-old boy entered its exhibit saturday. the gorilla dragged the child through water and was extremely agitated. but animal rights activists are outraged. here is jamie yuccas. >> no! >> cell phone video captured the terrifying moments.

the boy's mother could be heard calling to him. >> mommy loves you. i'm right here. the gorilla's death caused a furious reaction of those critical of the zoo's decision to kill the 17-year-old ape. today the zoo's director said tranquilizing the animal wasn't an option. >> we did not take the shooting of the gorilla lightly. but that child's life was in danger. and people who question that, or are monday morning quarterbacks, or second-guessers don't understand that you can't take a risk with a silver back. >> wildlife expert jack hannah tells cbs he agrees 1,000% with the zoo's decision. >> they made the correct decision. thank goodness a human being is alive because the decision of the cincinnati zoo made. >> the gorilla death is sparking outrage towards the mom. an online petition, justice for

harambe has 200,000 signatures. it wants the. >> brent:'s mother to face charges. kim o'connor says moments before she took this video she heard the young boy and mom arguing. >> i'm going to go in. no you are not. i'm going to go in. no you are not. and o'connor heard the splash. he was pulling the boy under water by is a ankle. his head is banging against the wall, climbing up. so that's the part that people didn't see. the boy's family released a statement saying he is home and doing just fine. going on to say, we extend our heartfelt thank for the quick action by the cincinnati zoo staff. we know this was a very difficult decision for them, and that they are grieving the loss of their gorilla. >> the zoo says its barriers are adequate and officials are looking at whether there are ways to improve. elaine, the zoo hopes to reown the gorilla exhibit by this weekend. >> a lot of strong feelings

about the story. thank you. sharks are suspected of attacking swimmers on both coasts this holiday weekend. that's next.

germany was hit with deadly storms over the weekend. rain triggered furious flash floods that swept away cars and most everything else in the path of the rushing water. at least four people have died. some 36,000 verizon workers will be back on the job wednesday ending a nearly

seven-week strike. unions and the company reached a tentative contract deal over the weekend. it includes nearly 11% raises over four years. verizon retreated on efforts to cut pensions and send call center jobs overseas. beach-goers on both coasts fell victim to suspected shark attacks this long weekend. in florida, a 13-year-old boy swimming at neptune beach was badly bitten on his leg while swimming in chest-deep water. >> at newport beach, california, a woman was bitten on her torso and shoulder. both survived. a top athlete may skip the olympics in rio because of the zika virus. pao gasol says there is too much uncertainty about zika which can cause severe birth defects. brazil is the epicenter of the outbreak. >> how best to honor america's fallen heroes? when we come back, a marine

journeys to the top of the world. ,,,,,,,,,,,,,,,,

we end this memorial day with marine's remarkable journey one of which almost ended on a minefield in afghanistan. instead he became the first veteran wounded in combat to summit mt. everest. jericka duncan has his story. >> reporter: it took charlie linville seven weeks to reach the top of mt. everest. this was his third attempt. he did it with a five pound prot thesis strapped to his thigh. >> i pushed my body to the ultimate extreme and came out victorious. that's confidence i get to carry forever. >> reporter: the 30-year-old marine, member of a bomb disposal unit was badly injured in 2011 while in afghanistan. the pain in his right leg was so severe he asked doctors to

amputate it. >> then all of a sudden i was in a hospital bed where people wanted to push me in my wheelchair, had nothing but pity, felt sorry for me. wanted to take care of me. soon after, linville was introduced to tim medvitz. founder of the heroes project featured on "60 minutes" in 2015. the organization trains gravely wounded veterans to climb the world's highest mountains. to help them regain their strength. and ready themselves for a lifetime of highs and lows. >> we are going to show you what you are capable of and what the prosthetic legs are capable of. and what this is, what you are capable of here and here. >> how have you changed as a person? >> when i first got wounded i was very depressed. and it really -- definitely flipped me 180 degrees from where i was 3 years ago. >> linville says this journey wasn't only about himself. >> when i got to the summit of

mt. everest. i took a few tokens of fallen service members, really great friends, that i remembered. i said a little prayer. not only for them, but for every service member that has given their life for our great country. the top of the world because for me that is as close as i can get to them. >> reporter: honoring those who died while learning how to live again. jericka duncan, cbs news, new york. that's the "cbs overnight news" for this tours day morning. for some of you the news continues. for others check back with us a little later for the morning news and cbs this morning. from the broadcast center in new york city. i'm elaine quijano.

hi, welcome to the overnight news. i'm demarco morgan. presumptive republican nominee donald trump will try to clear up questions. the billionaire businessman is expected to provide details into the money he says he helped raise for veterans' groups. sunday, trump reemfa sized his support for the military at the annual rolling thunder rally on the national mall. here is julianna goldman. >> reporter: good morning, as donald trump worked the stage his top aides worked beltway media fighting back against reports that the presumptive nominee's campaign is in a state of chaos and might lack the muscle it need for a likely match up against hillary clinton. >> i thought this would be like dr. martin luther king, where the people would be lined up

from here all the way to the washington monument. right? >> reporter: donald trump stood in front of a smaller than expected crowd at the lincoln memorial. >> do we love the bikers? yes. >> reporter: and delivered a standard stump speech in anything but standard setting. the presumptive republican nominee tore into hillary clinton, touted his controversial immigration proposals and paid tribute to americas troops and veterans. >> so we are going to rebuild our military and we are going to take care of our veterans. trump announced tuesday he'll announce the names of veterans charities that received money he raised earlier this year. >> weep just raised 6 million for the vets. the billionaire businessman has come under fire for not fully accounting for the $6 million he says came in from a january fund raiser just before the iowa caucuses. but while trump was in washington his aide were playing clean-up. >> what we have seen, success time and again.

campaign manager, cory lewandowski pushed back against several reports that trump's campaign is rife with infighting and being poorly managed. >> the media wants to perpetuate the story. the bottom line is we are winning. >> reporter: while the campaign chairman and chief strategist, paul manafort steered the conversation towards likely opponent. >> trouble follows the the clintons everywhere. people are frustrated with all of the drama around the clinton family and the history of the clinton family. >> reporter: trump's campaign manager says his team spent less money than the clinton kachl pain did and got better results. anthony, cory lewandowski says it is an indication of how a trump administration would run. >> front-runner hillary clinton is facing a close primary fight in california against bernie sanders. the delegate rich state holds its primary june 7th. meanwhile sanders is now using clinton's e-mail scandal to raise doubts about her electability. >> we come out of the democratic convention with the nomination.

donald trump is toast. >> reporter: sunday, sanders made it clear he wasn't giving up in california. >> california is the big enchilada. and floated clinton's e-mail investigation could be a liability. >> it was not a good report for secretary clinton something the american people, democrats and delegates are going to have to take a hard look at. >> reporter: a hard turn from this line last year. >> the american people are sick and tired of hearing about your damne-mails. clinton last seen in california friday was defended by supporters. >> hillary clinton broke no law. >> she was mistaken about that. she thought it was approved. >> if she was a man all this stuff wouldn't be the same at the same level. >> california its ready for the political revolution. >> reporter: even if sanders wins, clinton could still clinch the nomination. she only needs 73 delegates. that is just 8% of the remaining delegates. sanders says the democratic nominee system is flawed. >> you have a situation where

over 400 super delegates came on board clinton's campaign before any body was in the race. that's not rigged. i think just a dumb process. >> a win for sanders would give him negotiating power to shape the democratic party platform at the convention. that also means he could influence clinton's decision on a runningmate. some one sanders would view as being a progressive choice. another top story, dozens of animal rights advocates held a vigil at the cincinnati zoo for the gorilla killed to protect the 4-year-old boy. the zoo facing backlash over the decision to shoot the gorilla after the boy slipped through a barrier saturday and fell into the animal's enclosure. here is jamie yuccas. >> reporter: cincinnati zoo officials say the child climbed under the railing, through wires and over a wall. he ended up in the gorilla exhibit's mote, 15 feet below. the gorilla did not attack the boy, but officials felt because of the animal's massive size, it was a life threating situation.

we do want to warn you that some of the video you are about to see is disturbing. >> reporter: onlookers screamed as the gorilla scooped up a 4-year-old boy and carried him through the mote of the cincinnati zoo and botanical garden gorilla exhibit saturday. the child's mother can be heard calling to her son offcamera. >> mommy loves you. i am right here. >> reporter: the boy can be heard screaming. >> the gorilla has the the child. and is dragging him around the pen. >> reporter: after ten tense minutes the zoo dangerous animal response team killed the 450 pound gorilla the child taken to the hospital and released later that night. >> they made a tough choice and the right choice. they saved that little boy's life. it could have been bad. the reason that tranquilizing was not chosen is in an agitated situation, which the male was, it may take quite a while for a tranquilizer to take effect. it would take a few minutes.

>> reporter: zoo officials are criticized for killing the endangered western lowland gorilla. on facebook, justice for harambe received thousands of likes. peta condemned the killing urging families to stay away from any facility that displays animals as side shows for humans to gawk at. also under fire the children's parents. an online petition accused them of negligence saying they did not keep a closer watch on the child. the boy's family issued a statement sunday thanking the zoo staff, saying, we know that this was a very difficult decision for them. this isn't the first time a young boy found himself in a gorilla enclosure. in 1986, a gorilla famously guarded a 5-year-old boy after he fell over the ledge at a zoo in the uk. harambe arrived at the cincinnati zoo in 2014 and was one of the nine western lowland gorillas. the day before the incident he turned 17. >> the people who have an

opinion as to what should have happened to the gorilla they really don't know. >> oh, my god. >> kim o'connor shot the video. >> they didn't see it. they don't know how close to the end of the life that child was. >> at the time of the accident there were two other female gorillas in the exhibit that were called away. officials say in 38 years of operation there has never been a security breach at the outdoor gorilla exhibit. they are now reviewing the security they have in place. we'll be right back. why are you deleting these photos?

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the head of the cia rarely gives extended interviews. director john brennan sat down with "60 minutes" to discuss the biggest national security threat facing the united states. in a conversation first broadcast back in february, brennan provide insight into the fight against isis as well as concerns over cyberand biological terror. here is scott pelley. >> reporter: is isis coming here? >> i think isil does want to eventually find its mark here. >> you're expecting an attack in the united states? >> i'm expecting them to try to put in place the operatives, materiel, whatever else they need to do or to incite people to carry out these attacks. clearly. so i believe that their attempts are inevitable. i don't think their successes

necessarily are. >> can you explain to the folks watching this interview why the people want to kill us? how does attack the united states further their interests? >> i think they're trying to provoke a clash between the west and the muslim world, or the world that they're in. as a way to gain more adherence, because what they're claiming is that, the united states is trying to take over their countries, which is the furthest from the truth. paris was a fill year of intelligence. all but one of the eight terrorists were french citizens. trained by isis in syria. they returned unnoticed and attacked six locations killing 130 people. what did you learn from pair this? >> that -- there is a lot that isil probably has under way that we don't have obviously full insight into. we knew the system was blinking red and just in the days before that isil was trying to carry out something. but the individuals involved have been able to take advantage

of newtly available means of communication that are -- that are walled off from law enforcement officials. you are talking encrypted internet communication? >> very sophisticated use of the technology and communication system. after paris you told your people what. we got to work harder. we have got to work harder. we need to have capabilities, technical, human resources we need thup be able to have advanced notice about this so we can take the steps to stop them. believe me intelligence security services have stopped numerous attacks, operatives, that have been moved from maybe the iraq syria theater into europe they have been stopped, interdicted, detained, briefed, because of very, very good intelligence. >> reporter: the failure in pair ace loud isis to attack with bombs and assault rifles. and brennan told us, there is more in their arsenal. does isis have chemical weapons? >> we have a number of instances where isil use theed chemical

munitions on the battlefield. >> artillery shells? >> sure, yeah. >> isis has access to chemical artillery shells? >> uh-huh. there are reports that isis has access to chemical precursors ammunitions that they can use. >> the cia believes that isis has the ability to manufacture small quantities of chlorine and mustard gas. and the capability of exporting those chemicals to the west? >> i think there is always a potential for that. this is why it is so important to cut off the various transportation routes and smuggling routes they have used. >> are there american assets on the ground hunting this down? >> u.s. intelligence is actively involved in, in, part of the effort to destroy isil and get as much insight into what they have on the ground inside of syria and iraq. >> john brennan worked at the cia for most of 36 years. ever since he saw a want ad

while he was in graduate school. he was a high ranking kpek tifl here during the recent controversies. destruction and 9/11. do you thing of waterboarding as a dark time in the history of your agency? >> sure. waterboarding was something that was authorized. it was something that i do not believe was appropriate. it is something that is not used now. and as far as i am concerned will not be used again. >> you were in management here at the time. you've didn't stop it? >> no. i had expressed to a few people my misgivings and concerns about it. but no i did not, you know, slam my fist on the desk. i did not go in and say we shouldn't be doing this. i think long and hard about what i maybe should have done more of at the time. but it was a different time. the ashes of the world trade center were still smoldering. we knew other waves of attacks were planned and some that were under way. >> in the year or so before

9/11, the cia had a covert action plan to attack al qaeda in afghanistan. the administration at that time said, "don't do that. we have time. we'll deal with this later." and then 9/11 happened. is this administration making the same mistake now? >> well there are a lot of options that are presented to this administration as well as the to previous administrations. the president has pursued what he believes is appropriate for us to do in order to protect the citizens of this country. >> what do you think our policy would be after an isis directed attack in the united states? >> if there was a major attack here and we had isis fingerprints on it, certainly this would encourage us to be even moreorceful. >> if our policy after an attack in the united states would be to be more forceful. why isn't that our policy now

before an attack? >> i think we are being as forceful as we can be in making sure that we are being, surgical though as well. what we don't want to do is to, alienate others within that region. and have any type of indiscriminately actions that are going to lead to -- deaths of additional civilians. >> the cia brennan leads from langley, virginia, looks nothing like the agency he joined. if it's grown significantly. but the numbers are secret. cia fights with its own ground troops. and has an air force of drones. the complexity of the threats today is unprecedented. hacking, the emergence of a more aggressive china, north korea, russia and iran. and countries failing. all across the middle east. in addition to syria, you are now dealing with failed states in libya, somalia, yemen, how do you develop intelligence in all of these countries where the

u.s. has no presence? >> we need to be able to on rate in areas that are denied to us. we found a way to have our eyes and ears -- there, so that we can inform our policy makers. i do think though that this is going to be more and more feature of the future. and we here at cia are looking at how we need to enhance our expeditionary capabilities. and activities. because the -- we need to be on the front lines. >> well, do you imagine setting up cia bases, covert bases in many of the countries. >> i see cia needing to have -- a presence as well as a -- an ability to collect intelligence and interact with the locals and we are in fact doing that. in a number of -- those areas. >> to watch the full report go to cbs news.com. and click on 60 minutes. we'll be right back. one day a rider made a decision.

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something crazy. and so -- for me it was look what's the quickest way i can get to iraq. that is join the marine corps. >> reporter: was there a point where you said, uh o., what have i gotten myself into? >> as soon as i got off the bus on the yellow footprints and dude screaming mine face, i was like what did i do? this is a terrible idea. >> reporter: you may not recognize him, but military men and women around the world no the characters he created. >> appreciate what you do. it make is my day. >> reporter: in his comic strip terminal lands. >> thank you so much, max. >> reporter: he has hundreds of thousands of followers on social media and for some his message and his drawings have left a permanent mark. like the title of his comic strip, max is a terminal lance, which means he only achieved the row rank of lance corporal. he started sketching after his first deployment in iraq turping his experience into art. >> i found out there wasn't anything that accurately

represented my generation of marines it was really geared towards the older generation. >> reporter: terminal lance pokes fun at the marine corps in a satirical way, joking abut the food or serious, use, training and promotions. were you worried you were going to get push back. >> yeah, yeah, every day i thought i was going to get in trouble for it. >> reporter: especially when he makes fun of those in command because even retired marine corps four star general john f. kelly reads max's comics. >> because i was once a terminal lance. i get more of a chuckle than a lot will. it expresses frustration. it expresses lack of understanding. it expresses a lot of emotions. but i think it is almost always spot on. no longer on active duty, max spends his days, sketching every combing by hand. drawing on his own experience to tackle tough issues. >> this strip i really wanted to talk about the general apathy that your civilian friends back home have towards your marine corps experience. >> reporter: in the first panel,

aide, the main character is preparing to join the marines. second panel shows him returning from his first tour of duty. telling him i just got back from iraq. i have had a lot of profound, life changing experiences. his buddy back home in the same spot, looks the same. cool, did you kill anyone. >> you get back everyone is the same. >> everyone is exactly the same doing the same things when you left. >> me personally didn't feel i belong and end where any more. >> reporter: a terminal lance in the marines when he was deployed in iraq. he saw his friend get shot. back home, he couldn't stop thinking it was his fault. >> eventually it just turned into drugs and alcohol and other vices. it was very destructive path. >> then he discovered the comic strip and max's best selling graphic novel the white donkey which takes on a serious tone. with topics like ptsd and suicide. >> reading everything the author put down, max had written, helped show me a version of

myself that i had been dealing with and battling for the better part of a dock aid now. i do truly believe it wasn't my fault. i know it wasn't my fault. it means a lot to me that i can, i can actually say that out loud. >> i wanted to tell the story that really represented the reality of how deployments can go and how you can lose people that are really close to you, really in an instant, and it creates a conflict that doesn't have a resolution. >> reporter: after reading the white donkey, ben markatel realized he could turn his life around and now studying to be a therapist. >> i have something they can laugh at and identify with. >> reporter: max hopes civilians will read the book to get a better understanding of eat motional experience. thousands of men and women in uniform bring home from war. >> as has been voiced to me a lot of times, "you know, sir, i am really glad they don't understand what i have been through. if they did they would have been through it themselves." and it's better that they don't

know what i am talking about.,,,

as the summer season approach is a new government report is raising concerns about the water quality of public swimming pools. omar villafranca shows us what people should know before going for a swim. >> good morning. it its a startling report. the cdc looked at tens of thousand of pools from california to florida, to right here in texas. and what they found might make you think twice about jumping in. whether you are diving or doing the backstroke, swimmers expect the water in their public pools to be clean. louis sanchez inspects pools for city of plano north of dallas and checks chemical levels and looks for any problems. >> looking at the pool floor making sure that the drains and the bottom of the pool is completely visible. >> reporter: a new cdc report found that almost one third of

local health departments don't inspect their pools. which can lead to bigger problems. >> when i am going in there i kind of think of course is it clean, not clean? >> this public pool in new orleans was shut down last year after a number of swimmers ecame sick. >> my body was enflamed with rashes and itching and burning. >> my ears had been oozing and itching, enflamed. >> reporter: the cdc looked at more than 84,000 inspection reports from california, arizona, texas, florida, and new york. the states have nearly 40% of the nation's public pools. the cdc found almost 80% of the pools and splash pads had at least one violation. the most common, improper ph levels. followed by faulty safety equipment. incorrect concentration of disinfectants. the report showed that one in eight public pools were immediately closed because of serious health and safety violations. >> an example of a serious

health violation would be not enough disinfectant or chlorine in the water. in this situation, germs can spread among swimmers. robin manages public pools in dallas. she says at every pool, especially where youngsters are swimming, rule number one its, no number two. >> they're little kids. sometimes their bathroom habits aren't the same as adults. a lot of contaminants can be introduced into the water. >> reporter: adults can also bring germs into the pool in ways they might not expect. >> we want people to think, just because it is a pair of shorts doesn't mean it is a swimsuit. you have your pair of shorts for playing basketball. we want you to change out of those and put on a swimsuit before you get in the pool. >> that's the "cbs overnight news" for this tuesday morning. for some of you, the news continues. for others, check back with us a little later for the morning news and cbs this morning. from the broadcast center here in new york city, i'm demarco morgan.

it's tuesday, may 31st, 2016. this is the "cbs morning news." >> we just raised almost $6 million for the vets. >> it's the $6 million question. donald trump claims he raised millions for veterans, but where has it gone? this morning, trump says he'll have an answer. protesters stormed the stage at a bernie sanders rally. the secret servie surrounding the senator to keep him safe. roads have become rivers in germany. homes and cars being swept away by intense flooding with at least four people killed by the rushing wa.