>> other inmates craft sophisticated but illegal tattoo guns from parts of other items they are allowed to possess. >> any small wire can be straightened out and made into a needle. you can get motors out of appliances, tape recorders, cameras. >> when we see tattoo guns in prison, it's usually after they have been confiscated by authorities. >> pretty crafty, huh? >> i got the ink, i've got the tattoo needles, i've got the motor, the tattoo gun, the barrel. it's all right here. >> but we met a pair of cellmates who were so eager to show off their contraband tattoo gun, they were willing to reveal its hiding spot. >> watch him bro. >> i'm watching. >> this is my tattoo gun. i plug it up to the tv.