they left a print on the counter that later matched shoes in roy parker's possession.ut the key frames of video evidence she has are these images of the robber with his hands in the till. >> we were able to show the jurors, actually them looking at the defendant at the counsel table and looking at this particular video and they can see it is the same person. >> the jury finds parker guilty. he's sentenced to 86 years to life. but even when it doesn't capture the crime in progress, surveillance footage can be valuable for investigators. >> this is the individual we're looking at. the i.d. would put him at the store. >> the san bernardino detectives were investigating a string of home break-ins. they had a suspect, but needed evidence placing him in the area at the time of the crime, following up on a lead they found him captured on surveillance video at a convenience store at just the right time. >> we had the individual with the baseball cap with what appears to be the letter t. on the top of the baseball cap. >> these photos give investigators the edge they need durin