tonight, real live pet detectives. animals to the rescues. cracking cold cases, saving lives. tonight, animal csi. jack hanna with the columbus zoo. his show animals into the wild. and with him, robert cornfield from the police unit and with him, his special guest, sergeant joe friday. tell me all about sergeant joe friday. he s a 9 1/2-year-old german shepherd. both both of us just retired recently. and we are both enjoying retirement. he has a work ethic and wants to go work when it s really not the correct time for him. he had a great career. like when you re having your morning coffee? . right now, we have a nice life, living on a boat. we are patrolling the marina. he really enjoys that. tell me, how did you get involved with police dogs? i have been an officer now about 20 years and i started doing patrol work and i realized i needed something else to do besides doing patrol work. so i started the canine unit and right now it has grown to it is up to five