Well, opossum actually since this is the US. These Havahart traps work but I wish it had worked on the targeted ground hog instead of this 'possum;
What's amusing is that there are supposedly large fines in NJ for relocating wild animals yet the police recommended that we just let it go beside a river. One person at Animal Control suggested that we take it to Mount something or another and let it go. Finally after much calling and complaining they sent someone to dispose of it.
I asked the person who came for it what he was going to do with it and he replied that standard procedure was to take it somewhere (probably Mt. something or another) and just let it go, which he did free of charge and brought back the trap.