Regarding needles. One of the odder projects I worked on was for pumping out the BART escalator sumps. The old set up kept clogging due to hypo needles. Thousands of them would wind up in the sumps and when they filled up with storm water, the needles would clog the pumps, flooding the concourses. We set them up with a grinder pump/control system that eliminated the problem.They had one of those for a while in Santa Cruz, right on Highway 1 by River St. It was dangerous and disgusting and grew rapidly and got out of hand fast. They shut it down and moved all the tents out, there were thousands of needles on the ground when everybody left.
More than a few of my "I can't believe this is real" situations have been on BART projects. Some of the homeless are ingenious to say the least. Most need to be institutionalized.