I don't think the clinics are about the hard core users. But there are many, many lightweights - and they're the most likely to go to rehab, still want to have a life. A hard-core - they're already dead in their own minds. But the cocaine addict that works as an accountant, still making a living - he might go to the clinic.I have a hard time visualizing a hard core heroin (or other) addict, spending all his time and effort running around during the day to try to scrounge up enough money for another "bag" or two or three or four, probably by now being in the throws of withdrawal and taking his last $1 or whatever to hop on a bus to go to one of these SAFE clinics.
That guy is gonna shoot up in the first place he can find - which is just around the corner!
IMO, the hard core drug users don't think twice about overdosing.
The clinic that exists is apparently a success, according to those living in the neighborhood with it - got rid of all the druggies injecting right there in the street. Sure, they're just indoors, but they aren't doing it around the general public when they do that.