California Code, Welfare and Institutions Code - WIC § 361.1

(a) If a child is removed from the physical custody of a parent or guardian on the ground that the child may come within the jurisdiction of the juvenile court pursuant to Section 300, the child shall be returned to the physical custody of that parent or guardian immediately after a finding by the juvenile court that the child is not a person described in Section 300, but, in any case, not more than two working days following the date of that finding, unless the parent or guardian and the agency with custody of the child agree to a later date for the child's release. Nothing in this section shall affect a parent or guardian's remedies when a child is not returned immediately, as those remedies existed prior to enactment of this section.

(b) The Judicial Council shall adopt a rule of court to ensure proper notice to a parent or guardian regarding the circumstances and the timeframe in which a child is required to be released from custody pursuant to this section.