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That bombing in 1963. our fbi, our postal inspectors, the secret service do, their technology is so much greater than it is today. we have dna databases, we have fingerprint databases, we have all manner of ways where we can trace the materials. that's one thing that is going on right now. they're taking every piece of that -- of those devices and analyzing them for their source of origin, comparing them to each other, and so there say lot of things that can happen. i feel confident that sooner or later the person or persons responsible will be apprehended. but it will take some time. i go bac...

Smiling, having fun with her friends, having no idea that she would be dying at the hands of someone i believe was truly evil. >> during stephanie's autopsy, the medical examiner found signs of sexual assault and recovered a dna sample. this sample was compared to dna samples of all criminal offenders in both the state and national dna databases. there were no hits. >> there was not a lot of other evidence that was found at the crime scene. it appeared almost like what the suspect brought with him, he took away with him. >> investigators also compared the dna to every male who had any contact ...

And then you swab your mouth, basically hand your dna back to the authorities. then you could potentially have your charges dropped. the d.a. and the lab that helps process the dna both say this has helped solve a number of crimes. >> through the use of dna there's been cases out there that though you can get more arrests, more convictions. >> in one case in orange county, a man was actually charged with domestic violence, he exchanged his dna and then got that charge dropped. turns out his had dna was linked to hey homicide and awas arrested for that homicide. harris? >> but this is controver...

Stay there or head to one of the other three facilities which handle the state's 10,000 sex offenders. officials in one california county have been dropping the charges against thousands of suspects on one condition, that those suspects have to hand over a sample of their dna. experts tell us the number of law enforcement agencies creating their own dna databases has spiked in recent months and bringing up a key question -- do you trust authorities to keep human dna on file? supporters say collecting the samples could deter would-be criminals from committing future kriemz but civil libertari...

>> show me a single framer who said that. i have seen no framer who said that and spent years studying it. that's not what the text said and any family said. that's not what the state constitution said. you can have that view, but that's actually not consistent with scalia's text. >> let's push it further then. can we have -- is it permissible to have a database of the dna identifiers of every citizen in the country that would run as a matter of course when they interfaced with law enforcement. they want to make sure we don't have a rapist for an unsolved rape around the country running around...