I don't know what is going on with the possums and raccoons, but I have caught more of them in the passed 18 months than in all the time I have owned my house. I see way more road kill as well.
First thing I learned was, that you can catch 1, or 100 of the sumbitchs, and animal control would have anything to do with them. Unless like in Shooters case it is badly injured. But in a trap? Forget it. They don't even care to hear you trapped one.

So you have no choice but to do as rvrmom did, and take it somewhere and release it.
Killing a possum or raccoon is highly frowned upon.

Not exactly sure why mice, rats and gophers are fair game, but they are.