you're watching realtime video of a thief in the act of stealing a car. it happens over and over again. in fact, every 30 seconds another car is stolen somewhere in america. until just a few years ago las vegas led the nation in auto theft. [ sirens ] but the police here responded with a specialized unit called viper, and soon the crime numbers began falling. >> we have state of the art bait car program. >> we've been riding along with a lieutenant showing us specialized bait cars. >> this has a map. each car is represented by a color. >> here's how it works. two undercover detectives, a