You can ask If there is a police report that’s how it falls under the domestic violence requirement to let them out of their lease.  

Maybe 10 years ago, the police call me about a domestic dispute at one of my house. 

I had no idea what was going on until we got an order from the township telling us we are not allowed to rent individual rooms and they discovered this was happening due to the police getting called to a disturbance at the house. 

Realistically,  there isn't some 'garbage hauling police squad' monitoring this, so they would likely not get caught.

Think about how your rules affect their rights to carry on the same rights as an owner, which is what you convey by a lease, you can cover illegal activities easily, no business concerns in a residence, pet policies, care of the property, even additional administrative aspects that were not expected when the rents were established, like police calls, neighbor complaints, picking up trash or additional things they cause you to deal with. 

I’ve called the police on several occasions to increase patrol in the area. 

I've filed police reports but that will probably not go anywhere.

Police presence has increased by 400% in Ybor City recently.

He has a history with the local police and they offered (suggested) to be there for the move out.

Last weekend, there were police and emergency medics on the property 2:30am.