People addicted to substance do suffer and can produce negative externalities but spending money on militarised police which puts in jail anyone who possess a b

People addicted to substance do suffer and can produce negative externalities but spending money on militarised police which puts in jail anyone who possess a banned substance IMHO is not the best way to allocate (always) limited funds. What would actually help is not clear but I hate when politicians follow the algorithm: we need to do something about the problem, here is something so let’s do it (even if it doesn’t work or cost is too high for provided benefit).