@Donnie McGriffI Google their name, I search county court records for their name (criminal and civil), I search social media sites for any information I can find. 

Though the neighborhood could be a slightly criminal one, i.e. not the ideal location to raise a family in a peaceful environment, if you get the idea.

Generally speaking, I wouldn't accept someone with a recent criminal charge.

Don't expect to get any glowing credit rating from them but want to make sure they have no criminal records.2.  

@Timothy Metra I worked in the Criminal Investigation Division of the IRS.

Make sure to do a nationwide criminal check along with credit, employment and such.

If so, you might be able to just give notice that you're terminating your guarantee.Burning the place down would be a criminal act.

I don't consider any of the examples above as "uncrossed 't's and undotted 'i's"...Licensed real estate professionals should be held to a higher standard, and anyone who plans to not disclose a criminal record (DUIs, not paying taxes, etc), who plans to act unethically (place signs without authorization, etc), who plans to lie to clients (failing to disclose license status or dual agency, etc), etc, shouldn't be a licensed professional anyway.That's the problem with this industry...the barrier to entry is already too low, and it's scary to think that people think it should be EVEN LOWER...So yes, if anyone plans to act unethically and is concerned about getting caught, I agree that they probably shouldn't be trying to get licensed...it's better for them and the industry as a whole...

If the matter is possibly criminal, then I tell them to call the police - I can't do anything official based on "hearsay" anyway and the police can act much more quickly if there is, in fact, some sort of criminal activity.The best advice I can offer is for you to STOP getting involved today.

Paying rent on time doesn't mean they take care of the unit.Also, criminals have been in the news a lot lately.