Keep an eye on behavior.

So, I rotated at a VA inpatient nursing facility; essentially a unit for people who didnt need a full hospital admission needed a few weeks of nursing so they could finish a course of antibiotics, etc. The unit was very nice and recently renovated, and many of the patients were homeless. Given that people generally were there for a reason a blind eye was often turned to drug use etc in hope that people would hang around long enough to get their treatment done. Despite this being federal property, with security, nursing staff, etc, inside a VA hospital, serious behavioral problems were a constant issue. People threw parties and would have a bunch of friends over doing drugs, people were dealing drugs out of the unit to other VA patients and visitors, people were ordering hookers to the VA, etc.

Similarly, housing first policies (in which high need, chronically homeless, low functioning people get no strings attached housing) have had issues with people not just doing drugs but totally trashing their housing.

"Keeping an eye on behavior" in a low functioning, chronically addicted population is really fucking hard. People are not rational actors and no matter how sweet of a deal it is there are going to be people who don't follow the rules. This is not globally a kumbaya situation where people just want to be able to smoke pot in peace and talk about their feelings; there are going to be people who are get methed up and psychotic and smear literal shit on the walls, attack other residents, etc. What does "[committing] to providing support and help to addicts" look like when a resident's addiction and/or mental health issues make them a danger to themselves, fellow residents, or staff? If your solution to this issue involves institutionalization or incarceration, do you recognize that this alone would serve as a deterrent?