they knew what the outside looked like. we'll tell you how they managed to get in there and figure out what to do once they got inside. it's 53 minutes after the hour. >> it's quiet in professor jing's lab. don't be fooled. his team is hard at work, using computer keystrokes in the fight against crime. >> we are working in the area called biometric recognition. goal is to identify a person based on body character tests, could be fingerprints, face. >> matching data bases helps shrink the pool of suspects. >> that means it's a fairly good match. >> scan people's tattoos and searchs for similar ones. a match there could mean they've been arrested before or belong to a certain street gang. >> some part of fingerprints are missing. by bring burning off his fingerprints. >> before this data base was built police had trouble working