As @Joe White pointed out, they may face criminal liability as well if they collected money for taxes but failed to pay them. 

it certainly can be a criminal matter ..

They pay for their own tenant screening and that is going to tell us credit, criminal and sexual harassment. 

I have disqualified potential tenants quickly based upon public documents showing convictions, evictions, etc.  1.Fill out preliminary application.2.Verify application for 3 times monthly rent income, pay stubs, no felony, no evictions, at least 1 year on job.3.Query in Iowa Courts Online.4.Query Facebook. 5.Query Polk County Assessor (or county they live in). 6.Contact prior landlords.7.If applicant passes preliminary screening, send online application ($40 fee)8.Review screening for 600+ credit score, on time payments, income, eviction and criminal history.

Our state we worked this Oregon and Washington have made it illegal to do most anything with a home in pre foreclosure there are very stiff rules and some of it is criminal so we no longer do it at all.

It's about $20 for a basic criminal search and seems relatively thorough. 

You may have civil or even criminal liability issues with non-functioning windows in the event of a house fire. 

However, in that case consider the elements of criminal trespass. 

My background check includes a criminal records check. 

They are fully documented and fully legal.I don't know if a credit/criminal would show anything but you should definitely require proof of their ITIN to verify identity and their legal status.