I'd probably not have any more to do with him, than I had to. Reminds me of a guy I worked with years ago. He told about killing 19 turkeys during Ky. season. Baiting them with corn and shooting everything that came in.
That was the first thing I thought too. High Alert for sure and Ween your Family away. If he does that no telling what else he will do. GO!My biggest concern wouldn't be the poaching. First thing that came to my mind reading the OP is that this law breaking, self loathing scumbag is parenting the child my daughter calls her best friend. I'd immediately be on high alert looking for red flags from both my kid and her friend because it's well known how much kids are influenced by their friends. Sounds like a very serious and candid conversation needs to happen between your wife & you....hypothetically speaking. I'm sure the kid is sweet and it's not her fault that her dad is a dud. But through no fault of her own, her moral compass might be quite a bit different than your daughter's.