So what kind of liability issues might arise from any  city or county that sanctions this?  What if an addict OD's and dies  on site and the family of the addict chooses to file a lawsuit?   Will the city be liable?  or the county.  Maybe the individuals who run the 'show'? I'll tell you right now, somebody will.  It will be interesting to see how they try and skirt the issue.
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What about age restrictions. will they allow minors to shoot up too?  Will someone be checking ID?  Again, I don't think giving someone a safe spot to kill themselves makes any sense at all.  Will pushers, pimps and 'johns' be allowed in to  do their thing,  recruiting or hiring  new 'workers' and selling  them some  more 'candy'?  The whole thing sounds very dirty and criminal. But yes, it is certainly doing something different. 'Different' is not always smart.