San Francisco District Attorney's Office is governed by the City and County of San Francisco in California. The office is responsible for providing crime prevention and law enforcement services. San Francisco District Attorney's Office s bureau of investigation works closely with public prosecutors to develop documentary, physical and testimonial evidence for trial. Its criminal division is responsible for prosecuting crimes committed within the City and County of San Francisco. The office s special operations division investigates and prosecutes various types of corruptions and white-collar crimes. San Francisco District Attorney's Office also offers victim witness and compensation assistance, as well as services for families of homicide victims.