what goes through your name when you hear the name annie dukin. >> it brings disappointment and a lot of good hard work by a lot window. >>> a case of evidence tampering inside the crime lab and the risks in the justice system. >>> and the sound of music. [ ♪ music ] >>> ja and the voice of pro -- and the voice of protest around big ben, how sup, song and an assistance of community brought old friends and new together, even across a bitter divide. >>> good evening, thanks for joining us, i'm joie chen. it was an fbi take down in the shadow of the golden gate bridge raising questions about cops and citizen camera men, and a role they are playing in law enforcement. passers buy noticed agents as they grabbed a fumive, the koulent of a 3-day long -- fugitive, the subject of a 3-day long mann hunt. it's hard to go anywhere these days without being captured on camera. as mooted found, many of those ordinary citizens are finding themselves on the wrong side of the law. this is the front line in a new battle over the first amendment. on one side citizens demanding police reform. on the other

including annie dukin's in boston. they raping from downright fraud to a broader array of difficulties. sometimes it's not intentional fraud, sometimes it's not dry-labbing or, you know, pretending to do tests you haven't done at all, but rather something more inadvertent, which is the kind of bias that can come from feeling like you are part of the side, part of the team - that you are - you are attached to the prosecution, and you want to get the bad guy. that can lead honest analysts to make mistakes. >> this happens with some frequency when you look at the d.n.a. exonerations. 55% say there's some sort of error, improper use of forensic science that leads to the cases. >> that's right. faulty forensic science, whether it's outright fraud for something more limited, but equally disturbing, has been a significant contributor to a few of these exonerations. that's right. >>> what happens, why is it? you mention a team approach, a mentality. what would solve that? >> it is. one of the real dangers is a mentality. in mo