A worse, and possibly more dangerous scenario would be finding the perps in the act. What then? Particularly if they see you. Obviously, if you are not seen, you have the opportuntiy to back out and call the authorities.

Unfortunately, that would be a dicey situation. Even if you are sure they are the perps (and not another party who just stumbled on the same site as you), You are dealing with armed people but, would a citizen's arrest allow you to disarm them and hold them for police? What if they resist? What are you able to do under your state's laws?

Lots of questions. Any lawyers out there that actually know?