If he breaks in, he will be arrested and in way deeper trouble. 

I would ask her to call the cops next time she sees one, so they can arrest and prosecute the ghost for trespassing. 

Instead get a no trespass warrant taken out against her to stay off of your property and when she violates the warrant have her arrested.

He went back into the unit on July 4th and set off fireworks outside and inside, had a noisy party, vandalized extensively, got arrested by the police, and made the local news.

The detectives revealed seizing a large amount of substance to be crack cocaine, ecstasy, cash, paraphenalia convicted felon in possession of a handgun, resisting arrest, tampering with physical evidence.

So far most other interested parties for this house have appeared  worse -  pre checks have uncovered evictions, multiple arrests, etc. 

Then I hit them w the standards    How much income, credit score, have you ever been evicted,arrested or bankrupt and If so please tell me more.    

I've decided I have a hard-fast rule against felonies and recent arrests involving violence or drugs.

His arrest was confirmed by myself through county records.

Finally after giving names and ids (they didn’t get arrested because of that silly receipt they had) down comes the baby boy about 4 years old woken up from his sleep on my carpet with Sleepy eyes looking all confused and my heart broke.