Vancouver's experience proves that enabling addicts does nothing to help them.   I read that one man had been rescued from overdose 15 times.  From an addicts's point of view there couldn't be a better place or time to take massive doses of dope.  Today nothing can go wrong for a serious doper looking for the biggest rush of all.  Death.  And coming back from death.  Over and over.  All at taxpayer's expense.
I suggest a different approach that will  reduce accidental overdose to near zero.
  Instead of sending in the Naxalone team when an addict ODs send in the organ-harvesting team.  Harvest the usable organs and  staple  a thank you note on  the corpse.  Leave it where the addicts can see it for a day or so then throw it into the back of  a garbage truck.  
 I believe the number of deaths by overdose would drop to almost zero almost immediately if addicts stopped believing society cared about them and started believing we'd sell their kidneys on the organ transplant waiting list.