I read something on a forum once (I believe that it was on the Big Game forum of this site) where a site moderator had contacted local law enforcement about a poster who had entered a "big buck" contest. The poster was apparently bragging about his deer too much, and it turned out to have been taken in a manner that was not considered either legal or ethical.
The poacher was busted, and the moderator explained what had happened (including his part in this action) on the forum.