number of improvised tattoo guns. >> this one right here is pretty ingenuous. this appears to be a staple run through the head of an ink pen and it's attached to a motor. that looks similar to the motors that are in some of the air fresheners that are hung up in some of the offices. an inmate worker probably was in that area cleaning and smuggled it into the back and made a tattoo gun out of it. it's important that we find this stuff because it's dangerous. it's a sharp instrument in a cell. it can spread incommunicable diseases, hepatitis c, aids, the list goes on and on. ♪ please just give me a chance ♪ listen to what i've got to say ♪ >> garrett says he's known for two things in jail -- his rapping and his work as a tattoo artist. he says tattooing other inmates has been a steady business for him, usually in trade for commissary items and phone calls.