Welfare and Institutions Code section 109

(a)

Except as provided in subdivisions (b) and (c), nothing in this chapter permits a person acting as a CASA to participate or appear in criminal proceedings or in proceedings to declare a person a ward of the juvenile court pursuant to Section 601 or 602.

(b)

A person acting as a CASA may participate in determinations made pursuant to Section 241.1, and in all delinquency proceedings after adjudication of delinquency.

(c)

This section does not apply to a person acting as a CASA when that person is acting solely as a support person to the child or who is in court on behalf of a child who is the victim of a crime.