[user104658]

They reduce deaths from drug use - Scottish drug deaths dropped for the first time in well over a decade last year. London govt. probably doesn't want it because if Glasgow gets on top of its heroin deaths problem, England can't fudge their drugs stats by blaming them on Scotland any more.

You see, when the press reports that Scotland is the worst for drugs in Europe, it's not actually that simple. Scotland is the worst for drug related deaths in Europe. Not drug use itself. There are multiple reasons for that, and new safety measures will address some of those causes.