Cal. Penal Code § 1203.1a

The probation officer of the county may authorize the temporary removal under custody or temporary release without custody of any inmate of the county jail, honor farm, or other detention facility, who is confined or committed as a condition of probation, after suspension of imposition of sentence or suspension of execution of sentence, for purposes preparatory to his return to the community, within 30 days prior to his release date, if he concludes that such an inmate is a fit subject therefor. Any such temporary removal shall not be for a period of more than three days. When an inmate is released for purposes preparatory to his return to the community, the probation officer may require the inmate to reimburse the county, in whole or in part, for expenses incurred by the county in connection therewith.