I'm not sure if you've had a drug addict in your life at any point, and if not that is a blessing.
Drug addiction is a dark place and it's very common that the availability of free support programs is entirely rejected by the user, and the only hope at a normal life requires forceful intervention by family and friends.
The only way to solve drugs on the street is to look at the cities that have solved them and copy what works. And, at least with what I'm familiar with, arresting people tends to work and alternatives tend to not.
Drug addiction is a dark place and it's very common that the availability of free support programs is entirely rejected by the user, and the only hope at a normal life requires forceful intervention by family and friends.
The only way to solve drugs on the street is to look at the cities that have solved them and copy what works. And, at least with what I'm familiar with, arresting people tends to work and alternatives tend to not.