Since they typically leave pretty quickly once confronted, I haven't called the police...

I doubt they have the resources to police it, but who knows, municipalities have odd priorities. 

We ended up calling the police who eventually called EMS, and after much struggle, she was transported to a mental institution (they had to sedate her).

You may never see what I post in your life-time, but I guarantee you that you will be an extremely lucky person if you don’t see at least one thing that I show you in my photos.I have rented to doctors and police officers and they have done damages just as bad as some of the tenants that were low income.

Project manager told me the police found him the yesterday by the river. 

A special police force exists to protect tourists, and with tourism being the #1 industry nobody messes with tourists other than by trying to work some sort of hustle to separate them from their money).

If you have any questions please contact the police department. 

I think every landlord who owns enough units has the exact same property and we certainly run in to this problem all the time.When tenants bring guests into their units who are not on the lease I have mixed feelings in regards to how I want to police my properties.

How this will be "policed" will be another question in itself.

They may not think of it as protecting, but by not saying anything and not speaking to the police, they are doing just that.