Many states require a credit report review  maybe make it like a Lenders license I have U have full fbi criminal and personal financial and credit report.. does not mean you have to be super star but just cant be bad.

I know most of us have heard horror stories and/or have personal experience about criminals and unsavory characters taking over vacant properties then claiming squatters rights to avert the authorities.

Im mexican, I have been working with some International Investors.

Unfortunately, the registration system wasn’t quite finished, and we didn’t feel comfortable launching it before having a chance to test it internally.

There was actually a time not too long ago where police would investigate crimes and DAs would prosecute the criminals.

I know most of us have heard horror stories and/or have personal experience about criminals and unsavory characters taking over vacant properties then claiming squatters rights to avert the authorities. 

And he doesn't answer my international calls anymore (when I get brave enough to try), I don't know if he's getting texts. 

Good idea except I'm not able to get a realtor's license because I have a criminal record from way back when.

We then use an internal 3 comp approach for residential properties, an income approach on commercial properties, and a hybrid approach on farms.

Especially now that you've posted your suspicions on a public forum, I'm not an attorney, but I've watched enough Law and Order that I could see there being the possibility of you being charged for "Aiding and Abetting" their crime by not reporting it or "Criminal Facilitation".