He had an addiction problem in the past, had suffered a relapse and was moved into rehab.

Just hope they don't find any smack in an STR and have a relapse. 

I'd also like to mention there is the possibility of the Coronavirus relapsing again before the end of the year. 

Talk with him about his past and his risk for relapse.

They will spend tons of hours trying to weasel out of something as a game then honor their commitments.So income level Is only one factor of a tenant screening.I wouldn't want the risk to rent to someone who may not be reformed and have a relapse.

You could face legal action if he "relapses".

I just swore off tax-related posts, so you are making me relapse @Robert Perkins!

Don drug addicts even with the best intentions if they stay around the same people will fall back into old habits.So even if your son is clean today it's only a matter of time before he gives in again.He has to change his whole environment and even move to another state if need be to get away from dealers and so called friends.Your son will never be cured and it is a life long addiction.All he can do is live day to day and set himself up for success as much as possible to prevent a relapse or the frequency of relapse.Being a parent has to be defined and I am sure currently the drugs take center stage.Even though someone is in their 20's,30's40's physically that does not mean mentally they have the capacity or growth for that age.

These tenants have been there for 3 years and that’s when I relapsed the single room leases were not for me.

If she relapsed the parents would then be responsible for the rent.