Greg and Andi live in a camper that they park next to the sidewalk at the intersection of 13th and Folsom in San Francisco. As heroin addicts, the couple cannot afford to live in the city, but they also cannot afford to leave it. "Being a drug addict, San Francisco is the only option for us," Andi said. "The availability of clean needles and supplies, and the leniency the police give to addicts means there is no where else I would rather go. With its Salvation Army, it also provides the best opportunity for us to get sober when and if we want to."