Trespasser Neighbor Louisille - How to handle?

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Hi all!

I've been dealing with a trespassing neighbor at my house hacked duplex over the past couple of weeks. Neighbor will come into front yard and stand outside my tenant's bedroom windows and just do random weird things. Tenant, and surrounding neighbors report seeing a blue flame glow from a butane torch outside the window, pellet gun, and even him cutting a hole into the screen.

After an incident of opening his blinds and having what appeared to my tenant as a pellet gun pointed at him through his window by the neighbor, the tenant called the police. Police were unable to do anything because there was no evidence. 

I set up a camera to see for myself what was going on. (As far as I know, trespasser has not been doing these things to my side.) I caught trespasser on camera twice coming up to my tenant's window in the front yard, with what appeared to be a spray can in hand, and pointing it at the window. I called the police, they come out, watch the videos and go over and talk to trespassing neighbor. They warned him if he was on my property again, he would be arrested.

Well, a couple nights later, tenant has to call the cops again because neighbor is on property. Five officers come and tell the tenant they have to see trespasser on my property themselves in order to arrest. Of course, this is next to impossible so I'm at a loss for what else can be done. Neighbor continues to come on property in short spurts and deny everything when the cops get here.

Anyone deal with something similar?? How did you handle it??