Four months after voters approved the sit-lie ordinance, San Franciscans still await police enforcement. So some Haight Street merchants have taken matters into their own hands, which is working but provoking a backlash.

Some shop windows now display signs warning passersby not to sit or lie on the sidewalks in front of their business. But street kids and other opponents of the law are combating these measures with pro-loitering graffiti painted directly on area sidewalks.