Cameras, and trail cameras, motion activated.....On all areas around the house for sure....AND the road.....High traffic "customers", might not take kindly to a picture of their vehicles for evidence....Carry a pocket recorder, voice activated also.....Might not be able to use in court but lawyers love it, check local law on that first....Here as long as one person being recorded is aware (you), it is legal to record conversations..... Cameras would be the least I would do.....Document everything......You know what to do.....Oh and if you do have a detecting event, it might not hurt to invite a couple or few state police to detect also....Someone you could trust that is....
Since I don't think Drug running / Dealing should be Illegal.
Alcohol running / Dealing during prohibition didn't work & there are people who Supported Running & selling illegal Alcohol.
people also supported the underground railroad, which was also illegal
at one time.
imo we should not have a double standard about drugs then either .
so I won't be condemning him for that.
however the fact he has gotten violent, (I don't support Violence,
not directly connected to self defense in the heat of the moment) iF you can afford it
Cameras would probably be a good Idea.
Heads up though , you may want "Cameras" not Camera & perhaps
at angles to Hopefully catch them taking Shots at them .
because odds are if they have customers coming to the house getting paranoid.
your going to want proof of who's destroying them
it's a Tuff Call.
Actually a Sign is All you need.
on the Corner entering your Property.
let everyone Wonder.
at least unless le finds out it's fake and tells them.