San Francisco District Attorney's Office | 1,826 followers on LinkedIn. The San Francisco District Attorney's Office is one of the premier law enforcement organizations in the United States. Our mission is to collaborate with the City’s diverse communities and law enforcement agencies to make San Francisco one of the safest cities in America. Our office engages in public education and crime prevention efforts while maintaining the traditional role of investigating, charging, and prosecuting all criminal violations occurring within the City and County of San Francisco.