it has to be all one length. >> the barber shop is staffed by inmates, and one of them is responsible for making sure the clippers always remain sharp. >> i'm the barber maintenance inmate. we maintain and take care of the clippers. >> i was an iron worker. bridges, commercial buildings, power plants. >> because some barber tools can be turned into weapons, only trusted inmates are allowed to work in the repair shop. >> i go through an interview process and make sure i pick an inmate that's got some trustworthiness to him and mechanical skills. and he knows if he does something wrong, he'll lose a good job. >> but officer barnes' trust only goes so far. >> i maintain a visual on him at all times. we inventory the box on a daily basis, make sure all the