Drugs, Violence, and boardups all around. 

People in recovery need a place to stay free of drugs and alcohol.

Drug trafficking, sex trafficking, prostitution, people hiding from the law, etc.  

Personally, I've seen tenants granted a continued occupancy/renewal of their lease for the following:(1) threatening other tenants/neighbors with physical harm(2) dealing drugs out of the apartment with children residing in the same building(3) discharging a firearm on the premises(4) refusing entry to the landlord/his agent for necessary repairsAnd I am sure there are many other examples of bad behavior that the property owner is powerless to react to.

recovering drug addicts?

The tenant is having trouble with unauthorized day and overnight parking, as well as homelessness, drugs, etc.

So I been to prison and used to run the drug scene.

I guess it just all depends on having a system in place to alleviate issues that will come down the road.

Property managers still have to be managed, so they don’t alleviate your interaction with your properties.  

I found that estopple certificates are great for alleviating this exact issue.