California Code, Probate Code - PROB § 1516

(a) In each case involving a petition for guardianship of the person, the petitioner shall deliver pursuant to Section 1215 a notice of the hearing and a copy of the petition, at least 15 days before the hearing, to the local agency designated by the board of supervisors to investigate guardianships for the court.  The local social services agency providing child protection services shall screen the name of the guardian for prior referrals of neglect or abuse of minors.  The results of this screening shall be provided to the court.

(b) This section does not apply to guardianships resulting from a permanency plan for a dependent child pursuant to Section 366.25 of the Welfare and Institutions Code.