more than a favorite pastime, it's a passion, if not an addiction in every prison we visited. >> that's the first thing they do when they come in here, tattoo their body up. >> tattooing's cool. it's a fun thing to do. >> some of them don't make a bit of sense but they have them on there, they're covered. they all want them. >> i've got a couple years on a grave stone down here, a couple of my prison years, just a bunch of evil, crazy stay stuff. i was going through a bunch of stuff at that time. >> go to almost any prison in america and you'll find an amazing assortment of tattoos. >> it's gotten to a point where we have a standard question that our field producers ask the inmates. can you tell me about your tats? >> as you can see, i'm tattooed up. i'm from south vallejo. i represent south vallejo, always have, always will. 707, solana county. >> done by a good friend of mine. his name's carlos. this is joey. good homies, you know?