Cal. Penal Code § 4703

With the concurrence of the Attorney General, the district attorney may transfer the responsibility for the prosecution of any crime committed by prisoners in physical custody in the state prisons in the district attorney’s county. As used in this section, crimes committed while in physical custody shall include escapes and attempted escapes but shall not include any crimes committed while a prisoner has been conditionally released from state prison on work furlough, parole, or upon any other conditional release where the inmate is in constructive but not actual physical custody.