Get yourself a friend with a pick up truck. And another friend with a big hockey bag. Then another friend who is bendy (and helps if he is a ninja). Put friend C in friend B's hockey bag. Place both items in friend A's pick up truck. When junkie/thief (here after referred to as variable D), opens bag, C jumps on D and produces duck tape. Tape D to nearby tree, with a note. Call RCMP, and leave.
Charlemagne used to string up the dead bodies of Vikings on the trees at river mouths to deter future Viking river raids. Perhaps a few duck taped D's would produce similar results. Might even get the fuzz to take the area seriously.