You want to make sure that trapping a predator is legal in your area before you set any traps. Most trapping seasons run from the fall to early spring and require a license to be legal. That being said, if I had any problems with predators in a coop I would do what was necessary to get rid of the issue. I trap for a hobby myself and I have gone to people to ask for permission to trap their land and been denied, only to get called back later when they were having problems in the summer months with animals getting into their stuff. I had to refer them to an ADC trapper as the season was closed and I wasn't permitted to do ADC work. It ended up costing them more $$ in the long run, and their tune changed the following fall when I asked again.