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It's sort of amazing you're working together. >> we're working together because we went to them. when there were three quick xon raise in rapid succession a few years ago in washington involving three different analyst who is testified about hair matches, we looked at the transcripts, and in every single case they grossly exaggerated the probative value of the evidence. >> so you went to the fbi and said you have a problem here? >> yes, and they acknowledged the problem, to their credit. they said will you work with us to try to fix it? >> very quickly 20 years from now, what will be the thing...

It's sort of amazing you're working together. >> we're working together, because we went to them. when there were three quick xon raise in rapid succession a few years ago in washington involving three different analyst who is testified about hair matches, we looked at the transcripts, and in every single case they grossly exaggerated the probative value of the evidence. >> so you went to the fbi and said you have a problem here? >> yes, and they acknowledged the problem, to their credit. they said will you work with us to try to fix it? >> very quickly 20 years from now, what will be the thin...

In. and then the courts or upholding the value of finality don't let defendants off of cases come back in to challenge their old bad testimony after conviction so they are in a way in a trap. the federal government the last several years created a commission to try and develop better scientific testimony standards, better scientific research underpinning. bite marks, hair even comparing bullets tracing but bullets to guns which is another heavily used forensic technique. but at this point even the cases that you mentioned are just fbi cases the same 28 fbi examiners who interviewed now trained...

Reversed. a lot of these convictions relied only in part on these hair comparisons. the forensic science was only one piece of the evidence. but you are absolutely right that scientific evidence presented to a jury and i've seen it done as a prosecutor relied on it myself the jury reacts with credibility. the heads nod, the eyes open. and so it can have great impact beyond the specific point that it's used to prove. so i think there has to be an examination of all of this kind of forensic evidence, whether it's hand-writing or bite marks or ballistic analysis. this kind of forensic evidence ne...

You get. inside you'll find little triangular pieces with bite marks on the beaches out to sea. almost like these little bits. yes. >> so break it down, mechanics will crush them and then fish do their fair share. >> reducing the big bottles to smaller pieces. >> what is the reason they're chewing on it? >> the plastic itself looks like their food source or a biofilm on there. >> once something hits the ocean, how far can it go? >> it can go anywhere. the plastic doesn't always cross the equator. there's a few points the currents go north or south. typically, stay in its own hemisphere. >> it'...