Or look through what's in the bag they left. But I agree, some LPR might be very satisfying!
Many years ago, some people were constantly dumping bags of their trash behind a friend's house, on said friend's property. We just looked through it and found numerous pieces of mail addressed to the slobs. We then collected all of the trash, took it to the slobs' house, and dumped it all over their front yard one night. It never happened again.
Nice house, in a nice part of town that has city trash collection. Why the heck would they go to the trouble of hauling their trash a mile or so away from their place, when all they had to do was put it in the dumpster behind their house and it would be picked up by the city? They pay for that service in their water/sewer/sanitation bill every month. Why not use it?
People can be so stupid!