mr. gorgone, let's talk about the findings regarding the hooded jacket recovered from -- or that mr.wearing. i'm showing you state's exhibit 119. does that -- can you show us where there's a stain there or appears to be a stain there? >> that would be stain "c" which was on the back of the sweatshirt. >> am i circling it right here? >> yes. >> okay. so in addition to actually making your cuttings, you're photographing what you do so that if you had to come and explain it to somebody or testify about it, you would be able to say this is exactly where i got this cutting and this is where i got this result? >> correct. this is a photograph of before i did any testing. obviously there's no cutting taken there yet. but in my notes i describe chemical tests for blood, the result, cutting taken, cutting not taken, and so on. >> state's exhibit -- i'm going back to 203, i believe it is. i want to ask you about the results. let's talk about stain "a" that we've shown the jury already. tell us what your findings were regarding that, sir. >> stain "a" gave me a positive result for blood. for th

mr. gorgon is absolutely correct. biological material has to be kept dry and cold.u seal a piece of evidence in a plastic container, moisture is present and any kind of bacteria or fungi will grow. of course these kinds of organisms have enzymes that will break down dna. you can lose evidence, valuable information, by storing it the wrong way. >> but that applies to the sweatshirt. it doesn't apply to trayvon martin's fingernails where there was none of george zimmerman's dna, do you consider that a major finding? >> no, i really don't. i've worked on many cases, looking at fing ernail scrapings in a post-mortem setting. and almost always, you find no foreign dna. now i have it to add something very important here, the results that we're hearing about on the gun and other dna testing where they failed to find somebody's dna that's because the testing that is used in this laboratory in florida, is the normal pcr testing. in new york city, they do a high sensitivity testing which could have provided different results. i'm not saying anything is wrong with the results

mr. gorgon is correct. biohazard material has to be kept dry. it in a plastic container, moisture is present. and any kind of bacteria or fungi will grow. you can lose evidence, valuable information by storing it the wrong way. >> but that applies to the sweatshirt, it doesn't apply to trayvon martin's fingernails where there was none of george zimmerman's dna, do you consider that a major finding? >> no, i really don't. i have worked on many cases, looking at fingernail scrapings in a post-mortem setting. and almost always, you find no foreign dna. and i have to add something very important here. the results that we're hearing on the gun and other testimony, where they failed to find somebody's dna, that is because this testing that is used in this laboratory in florida is the normal pcr testing. in new york city, they do a high sensitivity testing which could have provided different results. i'm not saying anything is wrong with the results that they got but it might explain failure to get any dna where it actually exists. >> well, larry, when

mr. zimmerman. amy siewart, firearms. she mentioned the full complement of bullets, and i think we had good testimony about that. anthony gorgone of fdle talking about dna. you know, the problem with part of that dna, they got some. i think they missed a bunch or at least some because of the way it was packaged. significant? i don't know. i don't think it was that significant. there may have been more blood. i don't think that george zimmerman was bleeding a lot that night. i don't think he was bleeding a lot out that night. i think he was probably bleeding a fair amount in and then when he stood up after the attack was over, yes, they saw it coming out of his nose. not a lot of blood on trayvon martin. probably not a lot to be expected. and there was no injuries on trayvon martin til the gunshot, so you wouldn't imagine there'd be any blood on george. i'm sorry, george zimmerman's hands or any place else on his body because when trayvon martin was finally shot, he went up and over. so dna, we can go over some particulars about it, and i have some precise points about what was found on mr. trayvon martin's cuffs and what not. b