They don't care if it holds up in court.
I know a guy that the CO was gunning for. He knew the guy was poaching, taking over his limit, etc.
Opening day of pickerell, the guy had been out fishing and the CO comes for a visit. Chats with the guy about fishing and stuff for a while. Looks in the garbage and pulls out the hides. He counted over a limit. The guy says, well, other guys cleaned their fish here. He got charged with taking over the limit.
The guy goes to court over it and gets off. But..the CO cost him a days pay to show up in court, and 5 hours drive and gas to fight it.
PS I know the CO was right in this case