halverson: just look here, please. vu: a look at the state of surveillance. hello, and welcome to this special presentation "state of surveillance." i'm thuy vu. last june, we learned the national security agency has been collecting americans' phone records and e-mail for years. as a national conversation continues about the federal government's access to private information, local law enforcement in california are experimenting with new crime-fighting tools -- eyes on the street and in the skies feeding images to command centers. amanda pike with the center for investigative reporting shows us some of the new technologies now being tested. pike: officer rob halverson of the chula vista police department is testing a technology that could change how police fight crime. [ police radio chatter ] he's on a call to verify the identity of a woman just arrested for possession of narcotics. [ dog barks ] he doesn't need to ask her name or check her i.d. he just takes her picture. halverson: just look here, please. pike: his t

joy halverson, a california veterinarian, specializes in animal dna. >> it will not be as unique a profiles i might get from blood or saliva or hair with a root, but it will still allow me to say, yes, this sample matches the reference dog or it doesn't match the reference dog. >> halverson performed a pcr test, which stands for polymerase chain reaction. >> it's basically like taking one page out of a book and ignoring the rest of the book and xeroxing that page a million times. and now you have that page in so much quantity that you can see it. >> then the sample was sequenced to get a visual representation of the dna type. when she compared the dna from the hair in the ammunition box to a sample of keisha's hair, she found a haplotype in both sets that was extremely rare, occurring only in 1 in 300 dogs. >> the chance of having that match just by random was pretty low. combined with i'm sure the circumstances of the case, if i were sitting on the jury, i would find that to be a compelling piece of evidence in the case. >> this was forensic proof that rich was in possession of an item st

mcnutt: there is a trade-off. [ indistinct shouting ] halverson: just look here, please. vu: a look at the state of surveillance. hell