The For Sale sign or the realtor's lockbox, along with junk mail (advertising circulars left on the front door knob), are open invitations to the criminal element.

What matters to me is why is it low, no criminal history and no past evictjons/judgements.

Also -- in the "lessons learned" category -- if you don't want drugs in the house, make it an evictable offense in the lease. 

this will depend on if he is a guest or if he has established residency. if he has furniture there and mail coming in he is usually considered to have established residency and would need to be evicted. if he just stopped by for a few days, he is a guest and should be considered a trespasser. however, in fuzzy situations police can sometimes refuse to help under fear that they are putting themselves into a civil matter (eviction) as opposed to a criminal matter (trespassing).

That is why when we sell properties we get professional pictures taken for the listing.We screen candidates initially on the phone to make sure they meet the general requirements (no felonies, no evictions, take home income 3x the monthly rent) and then we always perform a credit, criminal, eviction check. 

Either move on simply offer what it’s worth- which may be offensive.  

(No offense to any folks in Hilo).

Finally, it may be strongly in the seller's interest to reach an amicable resolution with you least you pursue criminal charges against him. 

She is not responsible for the criminal acts of others.  

Your personal views toward "family" relationships have no place in renting, but if there is a valid reason, such as credit, poor rental history or criminal records you may have a basis for denial.