I think I've told this story here before: my brother used to have the authority to write littering tickets under environmental legislation. He was paddling one night at the local rapid and there was a man with his young son, fishing. They left a pop can behind. They were still in the parking lot when my brother was coming in. He identified himself and asked the man to go back and get the can. His son was all for it but couldn't go on his own. The man refused. So my brother wrote him a ticket, based on his driver's license.
When he spoke to his boss, boss was all for going ahead with the ticket. Turns out, the man had moved about 6 months before and had neglected to update his driver's license with his new address. So for refusing to go back and pick up a pop can, he ended up with several hundred dollars in fines, on top of the littering fine.