with the shakedown. >> prison surveillance cameras capture an officer in the first phase of the inspection, facing the scrutiny of a drug-sniffing dog. >> when the dog comes by, he locks up and freezes. he doesn't want to move. he indicates strongly on her. she has something to tell us. the staff member will raise her arm to indicate the dog hit on that person there. we got her under watch. the custody supervisor, the shift supervisor, whoever is available at that time will immediately converge on that officer. >> the marked officer is a young rookie, michele ellis. >> the canine indicated she may have smoked marijuana the last hour, hour and a half, maybe the night before. she was nervous when she came up to talk to us. basically she said i wouldn't want to waste your time or my time right now.