people using drugs has zero effect on neighbourhoods, what you’re talking about are the knock-on effects of drug use, pretty much all of which are easily solved by just providing people with necessities like shelter, food, healthcare and education.
the largest contributor to drug use is poverty, so if you want to see a reduction in drug use, start advocating for expanding welfare programs
I’m pretty sure I read somewhere that the statute of limitations for crimes against minors can be extended, because they were (obviously) minors when those crimes occurred, but I might be misremembering