Drugs are sold out in the open in San Francisco's Tenderloin district. Inside the fight to curb it

The California Highway Patrol may best be known for freeway chases and the Hollywood glamour of its motorcycle cops in television shows like “ChiPs.” But now the storied agency is patrolling the streets of San Francisco’s Tenderloin as part of a multiagency effort to crack down on rampant drug dealing that’s decimating the 50-square-block area.