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Tell the jury what zimmerman said happened couldn't have happened. trayvon martin couldn't have touched the gun because his dna was not on the gun as george zimmerman described it. so i think given that, my observations in the courtroom, i think it's going to be important to this jury. >> just because dna wasn't on the gun doesn't mean it wasn't washed away or it didn't -- >> the kind of testing they do is not high sensitivity testing. it's the ordinary dna testing. so if you've got 15, 14, 13 cells, you wouldn't see it. the limits of detective make it that you couldn't pick up small amounts o...

Evidence. because of that, i think it may not show us what happened that night, but certainly it may tell the jury what zimmerman said what happened couldn't have happened. trayvon martin couldn't have touched the gun because his dna was not on the holster or the gun as george zimmerman described it. i think given that my observations in the courtroom, i think it is important to the jury. >> just because it wasn't on the gun doesn't mean it wasn't there originally and got washed away in the rain. >> the testing they do for dna in this laboratory is not high sensitivity testing. it is the ordin...

The jury was. they were leaning forward. they were taking notes and they even laughed with him. he was very engaging with some pretty dull information, dna information is not that captivating, but they loved him. i think it's a result of the csi effect that we talk about all of the time. people just like dna and they feel like it's definitive evidence and because of that i think that it may not show us what happened that night, but certainly it may tell the jury well, what zimmerman said happened couldn't have happened. trayvon martin couldn't have touched the gun because his dna was not on th...

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, ...

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 they didn't find the dna using the standard level of testing on a case this important does it surprise you that they didn't reach for that higher level of analysis? >> that is a very good question. they happened to use it in new york city. the fbi does not favor this kind of high sensitivity testing. but there is a lot of research going on. it has been validated. it has gone th...