Region approves supervised injection sites, Cambridge immediately bans them.

[embe]

...Using an SCS is really not that different than consuming alcohol at a bar; you use a controlled substance under professional supervision. The difference is that nobody walking down the street is going say "oh look, a new SCS opened, I think I'll try that today" - SCS do not lead to increased first-time drug use. Another difference is that a drunk is much more of a danger to others (drinking and driving, fighting, etc.) than an user of opiates.

I think a pretty good differentiation could be made that most of the "controlled substance" being used is either a) obtained illegally (crime), or b) an illegal substance (crime). 

That may be the issue most people have.