Don’t push the drug narrative as that can get you sued for libel and slander in today’s politically charged America. You don’t need to gather photo evidence and put yourself in harm’s way for even attempting to do that. So stop all efforts on that front.
As a landlord you have two potential rights to solve this issue: 1) non-renewal of lease and 2) rules violation and resulting cancellation of lease due to that fact. Personally, I would get an attorney involved in any case like this and would not even begin the process until I talked to the state MHA and have a firm handle on the laws and options. Even then – on non-renewal of lease – there are many potential landmines that would make using an attorney essential.
But there’s also another issue to address. Are you 100% sure you’re getting factual information here? We have found that, over the years, it’s not uncommon for a neighbor to call management claiming that someone is dealing drugs because they just hate that person and want them driven out of the park. If the police have no interest in this case, it may just be that there’s no case. On more than one occasion, the supposed “drug dealer” is actually just somebody who has lots of friends and family that stops by. Before even thinking about non-renewal of lease (if that right is open to you) I would step back and gather facts and see what’s really going on. If you non-renew the lease of a perfectly good, paying tenant it will cost you $5,000+ to replace them, and the person making the complaint has no skin in the game at all.
I once had a resident come into the office to claim a neighbor had kidnapped their daughter and demanded they be immediately thrown out of the park. I told them “if they kidnapped your daughter, why haven’t you called the police?” to which they said “I did, but the police didn’t do anything”. I told them that kidnapping is a serious accusation and I was not going to even think about this issue until I saw a written police report. Never saw the resident again. Later on I heard that the neighbor in question had been dating the daughter and the father hated them and wanted them out of the community.
Bottom line is that there are many personal narratives going on in the park at all times and you don’t want to get sucked into them. If a resident is paying rent and following the rules, then your job as owner is fulfilled. You are NOT a police department. Leave law enforcement to folks in that line of work.