Adrian Monk: Captain, I don't think it was him or anybody in his group. You heard him. Each of those three jags means something. Any real member of the Brigade would have known that. But look look what was painted on Mrs. Parlo's wall. Two jags.
Captain Stottlemeyer: How'd you know he had a tattoo on his arm?
Adrian Monk: Oh, uh, I didn't. His other sleeve was rolled up.
Captain Stottlemeyer: It wasn't even.
Adrian Monk: Exactly.