Right now, nothing. If you build enough shelter space, by law, you no longer can make these decisions. If there is enough shelter space to house the homeless population, the choices become go to the shelter or go to jail. This is why we need to build more shelters as soon as possible.
What if they don't want to be on medication?
> if they are on drugs, get them into a program like NA and give them the medication to combat the withdrawl.
What if they have no interest in doing that?