Drug trafficking, sex trafficking, prostitution, people hiding from the law, etc.  

There’s either drug dealing, prostitution or a combo of both going on.

There are four apartments on the upper floors.The neighborhood is 10 years into the early-artist phase and shows signs of other development activity happening, but is still has a lot of drug and prostitution activity.

Just because sex wasn't mentioned in the contract doesn't mean your not getting busted for prostitution because the intent, regardless of the verbal contract details, was sex for money.Wholesaling if done correct is perfectly legal, you can most certainly assign your interest in a contract. 

I rent to refinery contractors....welders, boilermakers, pipefitters, etc.Some guys find out about my places from the local prostitutes. 

Were the police calls noise related.. get time and date of calls.Give her written notice of Non-compliance, Noise violation, High Traffic (unauthorized people at all times of day/nite), prostitution (more than likely).. and dont forget the trash.I'd do a letter of mutual lease termination with the notice on non-compliance, and say if she agrees to vacate, in writing within 5 days,, that's by Sunday at 5 PM you will not file eviction action on Monday at 9AM.

You live in a state that feels prostitution and kids playing doctor are at least Tier 2 sex offenders and mark their drivers licences. 

I mean it seems to be the right kind of place because at night you don't see questionable behavior, i.e. prostitutes, drug deals, etc.

Based on what we know and found out from neighbors, although we don't have any abstract evidence, Tenants were misusing the property to run a Prostitution type of business, massages service etc.

I had section 8 tenants involved with drugs and prostitution.