We inherited tenants who had been in jail multiple times and the girlfriend was on house arrest.

One of them got arrested and the other one does not feel safe. and moved out.  

His arrest record didn't look so good.

I am not by any mean specialist in law and better to ask lawyer first but here are something that you might want to try :If you think she is endangering your life or other people life then call the police, if she threating you then you might be able to get her arrested or at least getting some police investigation going on, people who are involved in criminal or shady activities hate to see police ringing their door, infact she might leave very quickly if she know there is a police involvement.

I asked him what else he did and he said he had been hired to go to central America and kidnap white collar criminals who stole from their business or partners.. they would grab em put them on a private plane and have the arrested once they landed in the USA..

Google them.I once found an arrest of an applicant by just doing a Google search.  

They were all arrested at myproperty, and needless to say, I declined their applocation.

Some investors flew in from Israel to find their properties were abandoned and unlivable.Eventually, Dov got arrested on a federal warrant and the judge took away his passport.

Is it moral to race towards cardiac arrest?

I've done it when I started out and no one kicked down my door to arrest me.