Cal. Welf. & Inst. Code § 7375

Whenever a convict is received into a state hospital under the provisions of Section 2684 of the Penal Code, the medical director of the state hospital shall, 90 days after the arrival of such person and each six months thereafter, report to the Director of Corrections regarding the status and progress of the person. The convict shall, on recovery, be returned to prison in accordance with the provisions of Section 2685 of the Penal Code.