If they spent ten years in prison for drug dealing, but have been out for ten years, have been sober, stayed employed, and paid their bills, there's really no risk associated with their criminal past. 

By talking more to the police, we found out that the main tenant had a long history of inviting guests in exchange for help around the house and that those relations would always turn tumultuous and that the police visited the house several times each quarter over civil complaints, suspicious activity, noise, drug related activity, and a bunch of other civil nuisance type of calls.

If I have had a negative tenant experience (late payments, hostility, drug use, damaging property, etc) one of the options available is for me not to release.

We are the ones coming in and returning dilapidated & distressed houses, some that have been vacant and sources of problems with drugs and squatters for many years, back into functioning homes to communities that desperately needs affordable housing... where we are actually resented by the cities, placing one barrier after the next in front of you... 

Also dealing drugs and other criminal behavior.

Tenant on government assistance, known drug dealer and suspected of various crimes including two murders, arson etc (prime suspect never prosecuted).

She advised me she was a convicted felon for drugs and had a pending court date in 10 days.

After my father passed from alcohol and drug abuse complications, he triggered debt collectors calling me with aggressively wild threats for a few years!

I consider Arecibo a place with higher crime and drug use and definitely not as much of an ex-pat presence when compared to cities 45 minutes west or less.

Many nightmare stories about house next door a drug house, or issues with that location or street that would not be known until you visit