The validity of that tenant's occupancy is one thing, and that's up to the courts to establish but the right to quiet enjoyment while a tenant (Legit or not) would be an entirely different thing, that could end up being costly and potentially physically dangerous for you.

What are the dangers I should look for (if any), or should I not do it at all?

Attempting to advise them in legal and financial matters is dangerous, surround yourself with experts, don't try to be one. 

There has been an explosion of Gurus, many of whom don't know crap.

I agree that sometimes there can be something intrinsic that's not in your face that can give hints about danger, but most of those situations have to do with either picking up on non-verbal cues from individuals, or your body telling you not to let your mind override facts and probability. 

The actual eviction can be a dangerous situation in this day and age.Whatever you do do not meet this tenant in person to discuss the matter. 

We know there are market cycles, but not taking precautions when signs are obvious is dangerous. 

Like stated above, there is definitely growth in the riverfront as well as new construction in the area, but it can be dangerous to buy on speculation of appreciation. 

Thank you for the podcasts (I listen to them all the time) and to all my fellow members as armed with enough information to be dangerous, I proceeded with "confidence" and found and closed my first MLS originated deal in July and rented it by October and then was able to close another FSBO found on Craigslist in December and rented it February on a 2 year lease. 

I suspect years of social conditioning contribute more to fear than any actual danger.