If they don't have permission they will be arrested immediately.

If they are caught on the property again they will be arrested for trespassing.Dont take the cheap route, hire a lawyer immediately that specializes in evictions and he will handle the rest.   

He had an arrest for possession in 2001 with charges dropped for weed, He did not fill out the application as I have seen other more respectable tenants have and claimed he has bad memory of his a past rental; which I got scant information back through a search on a site equivalent to Peoplefinder.

The police decided to arrest everyone present, including the two war vets.

However, combined with the other new laws that make squatting a crime, you could have a squatter arrested by the police. 2.

Anyways if it's just between the Tenant and Me, I can take the pain but my latest drama filled episode has now drawn the attention of the Condo Association.My Tenant decided to go knock on the neighbors door, what followed is a grey area but the neighbor called the police got all freaked out my tenant gets arrested for disorderly conduct.

I would also check court cases online using his name to see if he might have been arrested/incarcerated by the police.

After talking to him a little while longer, I came to find out that he had multiple warrants for his arrest, he was always trying to hide from the government, and he was now only investing outside of the U.S. because he couldn't make a deal within the country without getting caught. 

@Troy Young technically it is illegal to rent out other peoples houses for money but I've never heard of anyone being arrested for it.

The police apparently showed them a picture of a white male who was supposedly staying at the house and wanted in relation to drugs.I've never heard of such a thing where the people in the house were not arrested.