ATF Agents Befriended, Arrested Mentally Disabled People in Stings

Also damaged buildings used for operations

Aaron Key wasn't sure he wanted a tattoo on his neck. Especially one of a giant squid smoking a joint.

But the guys running Squid's Smoke Shop in Portland, Ore., convinced him: It would be a perfect way to promote their store.

They would even pay him and a friend $150 apiece if they agreed to turn their bodies into walking billboards.

Key, who is mentally disabled, was swayed.

He and his friend, Marquis Glover, liked Squid's. It was their hangout. The 19-year-olds spent many afternoons there playing Xbox and chatting with the owner, "Squid," and the store clerks.

So they took the money and got the ink etched on their necks, tentacles creeping down to their collarbones.