At the bare minimum you need a safety harness, ascender/descender or Rope Grab, need to know how to use and wear it properly, need to have a second person capable of reaching and assisting you if you DO get fall arrested and happen to go off the roof, and you need permanently mounted roof ridge anchors.

They put the person/s on No Tresspass, if they come back they can be arrested.

He’s been in a coma for a week and there is a cop posted to arrest him.

I myself have considered carrying a sign at one of those "free" seminars but I do not want to be arrested for "disturbing the peace". 

And, going forward, add a covenant to your lease that states that 'this is a crime-free property' and that any allegation of an illegal crime does not need to lead to arrest or conviction for the tenant to be immediately evicted from the property and that the tenant agrees to voluntarily and immediately depart.  

I also want to avoid loss of rent because my tenant is arrested and convicted. 

As he had been in the house 2 years and the unit was about 10 years old the cops told him if he came back around they would arrest him.

Unless they are breaking the law and can be arrested, there's not much you can do in the next three weeks except document.

They want you to renovate and sell the house so that you help keep their property values up and give them good neighbors.I’ve had neighbors give me the lowdown on other neighbors including a house that had a guy arrested for breaking into the local houses.

The cops have been called out to my property multiple times and made multiple arrests of these people while I patiently waited for the moratorium to end.