In addition to laws of many states, that allow local governments to seize assets involved in crimes, particularly in illegal drug-dealing; a new interpretation of the British Common Law of the Middle Ages, allows U.S. police dept.'

Crime Free / Drug Free Addendum is important to have,, for any rental property,In this case the more than likely even without the girlfriend pressing charges the "police dept" followed thru and he more than likely had a charge made.I don't know enough facts about this landlord and what happened,  but the point is if a incident happens on your property you need to be decisive and take action. 

There have been formal police reports filed, any suggestion as to next steps or any experience you’ve all had?

I know many D class landlords and do not know of one single landlord who hires a security guard to collect rent.Further, I worked as a police officer in some of the worst neighborhoods in Long Beach, CA for over a DECADE and not once was I ever dispatched to a robbery of a landlord, attempted robbery of a landlord. 

The police HATE dirty landlords with histories.

There is a rat out number to police STRs in LA and someone has a full time job enforcing the units starting 11/1. 

Prior to that I worked in a factory and before that the military and police.  

How can I stop the police from picking on me when I choose to drive over the speed limit?

If you can prove intentional damage was inflicted to your property, you can file a criminal complaint with the local police.

The only thing that holds society together is the threat of force by the police.