The most recent tenants (a behavioral therapy group) moved out last week for a larger location.

Is it normal to do a criminal background check along with the credit history?

The difficulty from what I see is that these sorts of scams are mostly small and local police are ill equipped to investigate and prosecute especially since most of the criminals are not local.

(Sadly, Elon was more interested in the Twittersphere.)The way laws are written/enforced; it's almost impossible to prosecute and convict competent white-collar criminality, as the smart crooks have found all manner of ways of creating quasi-legitimate facades/presentations that play on people's gullibility and "greed"....this ethos permeates all sectors.

The behavior aspect is the most important in my opinion.

Those thoughts and beliefs are dictating your actions and behaviors constantly, those actions and behaviors you take put various causes in motion, which have various effects that you see in your physical reality that you've created.

They didn't care that she was on the fast track to becoming a criminal.

Warren are thought to have perpetrated a $100 million dollar Real Estate ponzi scheme under the leadership of alleged criminal master mind Lawrence Leland ‘Lee’ Loomis.

Remember, it's only breach of contract - nothing criminal.

If her financial/criminal/previous landlord records check out I'm inclined to accept her with a bigger security deposit, so that she has a stake in keeping up the house, as her money will pay for repairs beyond normal wear and tear.