I used to live in San Francisco at the corner of Guerrero and Market, about 200m from where some do-gooders operated the needle exchange on Duboce between Market and Church. On the day after the needle exchange I always had to 1) remove some unconscious drug addict from my stoop, either by just shoving him out of the way or by calling an ambulance in extreme cases, then 2) put on a disposable Tyvek suit and pressure-bleach all the feces and vomit off my porch. Meanwhile the "harm reduction" perpetrators were at their own homes which were evidently in far-away neighborhoods.

The only way needle exchange fits into civilized life is as one aspect of a shelter-first treatment scheme that gets these people to a place where they can vomit in their own rooms for a change.