The Board of Mental Health, in its discretion, may grant a conditional discharge to a patient admitted under this chapter after the expiration of one month from the date of admission and may revoke any conditional discharge so granted. A revocation of a conditional discharge by the Board of Mental Health at any time prior to the expiration of the original term of hospitalization shall be sufficient warrant for the return of the patient to the hospital from which he or she was discharged, there to remain until a subsequent conditional discharge or the expiration of the full term from the date of the original admission. (Added 1967, No. 305 (Adj. Sess.), § 1, eff. Oct. 1, 1968.)