Well some strategies are, for example, getting people into long-term housing (instead of into temporary and restrictive homeless shelters), providing basic needs like food and clothing, and otherwise addressing the problems that cause people to be on the street and chronically homeless. Those are all the purview of social workers, though. The other approach would be to just lock people up, at expense to the state and with basically no chance of long-term behavioral change. Is that what you'd suggest? (Also safe injection sites are not on the street they are indoors???)