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It doesnt make any sense. theres not enough of your dna on trayvon martin to make the point he was beating you down, and on top of you the whole time, as you explain. you say? >> i say number one, if were going to talk about fingerprints, fingerprinting is a technique, not aseason. theres virtually no way to apply any science to any print, how long a latent print will stay on a surface, especially one like a gun. number two, dna deteriorates. theres substantial evidence here number one it was ra...

About proficiency testing in terms of testing yourself and also your lab to make sure that what you all are doing is working properly? >> a proficiency test is a test given to me by an outside company. its mailed in and its a set of samples that i have to work as if it were a regular case. and i perform that testing and send the results back to that company. and then they send a notice back saying, yes, you got the correct results or, no, you did not get the correct results. im required to take ...

>> if i could show that to the jury, your honor. all this terms of writing on here in terms of your initials would be on here right here. right? where would your initials be on here? >> right here. >> okay. that would be true of all of the exhibits, in other words, you could verify you actually did analysis on this? >> yes. >> it would have your fdle number and i think you said the yellow quick card or whatever you call this label is also fdle. >> yes. the yellow barcode label is also from fdle....

Again, your honor? im going to give you this fancy pen, i guess, or whatever you call it. i think the buttons right -- you see it? okay. lets talk about you got three columns here. and lets -- actually, i think i can do it here in the red, too. you do green. ill do red. lets talk about this description right here. what are all these? i know theyre referred to as loci. what does this mean right here? >> these -- this column right here is the -- they are the names of the 13 locations that i tested...

He shot trayvon martin. i want to bring in george howell outside the courthouse. feder first of all, lets talk about the firearm analyst. explained how close these two were because o of what she learned from the residue of the gun. can you explain why that was significant. >> reporter: she explained the process. he did a distance examination where she took some of the live rounds that were in that gun that she was testing. i think there were seven. took some of those and fired shots into samples...

At a few steps during the way. those would be blank samples. those samples need to remain blank the entire process. >> in the lab while youre analyzing evidence thats submitted in the lab, do you wear any kind of clothing attire to make sure that you dont cross-contaminate anything? >> yes. whenever i have an item of evidence open and im physically examining that item, im required to wear a lab coat, a mask, gloves and sometimes a hair net depending on the item. when im actually working with the...

With your initials would be on here, would i be right? i got it right? what would your initials be on here? >> right here. >> okay. that could be true of all the exhibits in other words, you can verify you actually did analysis on this? >> yes. >> it would have your fdle numbe number, i think you said the print card label fdle? >> yes. the yellow card is from fdle. >> now, i think those were referred to as standards, correct? known standards from george zimmerman and also trayvon martin, is that...

African-american, and hispanic as opposed to southeastern hispanic. >> all right. well, lets talk about specifically what you did in this case now that weve got the basic stuff out of the way. i believe you did three reports in this case dated march 26th, may the 9th, and july the 26th of 2012. its under fdle 2012. your reports and your entire file has been copied and provided to defense counsel. with the courts permission, may he refer to his report or notes at any time? >> any objections? >> n...

Foul odor when he opened the bag ta unfortunately it was placed in a plastic bag instead of a paper bag. that means the biological evidence risked degradation. that was his term. the analogy was given if any of us has a gym bag with wet clothes and we leave it in the car too long and open it a week later and theres that very strong smell, thats the smell that came from the sweatshirt. let me back up to explain what happened on the direct examination of this expert. so the direct examination of t...

We went to the skittle cans. at the end of the day, i dont know that this really carries the day in terms of one way or the other. the prosecution ultimately has to put this evidence on. i dont think it goes to the guilt or innocence of mr. zimmerman. >> lisa, does this information youve heard so far help the prosecution? >> its another piece of incremental evidence that helps the prosecution. i get two takeaways from this testimony. one is that the dna expert says theres no dna from trayvon mar...