RE:What do you do?!
It's a good idea to report the infraction to the EP regardless of physical evidence. When reporting include as much info as you can, time, place, description of the individual. Ex. 5:30am pole 205 mainland side, 5'10" wearing jeans and a white T-shirt sloped forhead and protruding jaw. All kidding aside if you report the time and place, license plate etc... EPO may pay more attention to that location. I made a report about someone who was poaching trout at little pond. The EP asked for a vehicle description, time the person fished and location. I don't know if a citation was issued but I at least feel as though I've done something put a stop to the problem.