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The defense is claiming this was -- in the words they used in opening -- a vicious beating. not a bit of dna in trayvon martin's fingernails. as you also know, another part of the defense story is that trayvon martin was reaching for zimmerman's gun. according to what osterman said about what zimmerman said, trayvon martin had grabbed the gun and zimmerman had to break the grip. not a bit of dna fingerprints of trayvon martin on the gun. that's another helpful factor for the prosecution. >> seema -- >> it is helpful. but let's put this in perspective. that touch dna, meaning me just touching y...

And fingerprint purposes. >> when you say touch gna, what does that mean. >> it's not like touch dna for physical blood. it's something you may not see. >> how do you process an item for touch gna? >> use aster aisle swab with distilled water, put that on the tip of the stare aisle swab, swab the area for a few minutes, package it, and secure it. >> all right. and did you do that with the firearm in this case? >> yes, i did. >> and can you show the jury what areas of the firearm you processed for dna? >> yes, i can. >> i processed the grip, which is on the backside, the trigger, and the back p...

Added later for courtroom security? >> it's been added later. >> all right. if you would then, please hold up the holster containing that exhibit. thank you. >> your honor, i'm sorry to interrupt. may we have the exhibit number, please? >> i believe it's 154. >> it is. >> thank you. >> officer smith, did you wear glov when you handled that firearm? >> yes, i did. >> and why did you wear gloves the. >> to preserve any evidence. >> did you process the firearm in any way? >> yes, i did. >> and how did do you that? >> for which processing method? >> well, that's what i'm asking you. >> okay? >> in...

We know that investigators have been looking for any kind of evidence on the remains of the pressure cooker bombs. looking for hair samples, for any dna samples, for finger prints, for example. now we know it has tested positive for dna. we also know that the fbi retrieved a dna sample from tamerlan tsarnaev's widow, catherine russel, at her parents' home in rhode island. now, just because they took a dna sample and even if hers should match, the female dna sample, on the pressure cooker, it doesn't necessarily implicate her or any other particular female in terms of whether they had anythin...

Collecting dna from the wife and now, obviously, female dna on the bomb. she could have come into contact with this and not have anything to do with making it, right? >> that's absolutely correct. we're talking about skin cells. we're talking about touch dna. you leave yourselves and you leave your dna behind. one of the problems with dna, we don't know when the dna got on the object. it could have been a day, a week, it could have been two weeks before anything happened with respect to construction of the bomb. so we can't jump to any conclusions. the good news is we have some information, we...