San Francisco has a public pooping problem. This article has someone suggesting a solution but the best solution was made around 10 years ago when the city wanted to install public self-cleaning toilets on the streets. What happened? Well the handicapped groups said they couldn't use the ones the city was going to install. The French company that makes the self-cleaning ones said that it wasn't possible to make bigger ones plus larger ones would get used for drug deals. What I thought was the solution there was the solution this guy advocates but for handicapped only.
http://www.sfgate.com/news/article/How-to-solve-San-Francisco-s-homeless-pooping-6465355.php And the other part of the problem needs to be solved to and that is to return government help for the mentally disabled to help them get back on their feet.