We put sharps containers on all of our construction sites. It can be a major problem in some areas, We do a fair amount of work in some of the tougher neighborhoods in SF. We clear the pedestrian walkways each morning and have documented training programs for all those who handle the used syringes. I had one particular jobsite in the tenderloin district, a dealer worked the sidewalk directly across the street. The majority of the junkies, looked just like you and me, suits and ties or clean looking middle class individuals. Times really have changed.