California Code, Welfare and Institutions Code - WIC § 16519.63

(a) An administrative law judge conducting a hearing pursuant to this article may permit the testimony of a child witness or a similarly vulnerable witness, including, but not limited to, a witness who is intellectually disabled, to be taken outside the presence of the respondent if all of the following conditions exist:

(b) If the testimony of a witness is taken outside of the presence of the respondent, the county, or the department in an exclusion action, shall provide for the use of one-way closed-circuit television or video so the respondent can observe the witness' testimony. Nothing in this section shall limit a respondent's right to cross-examine the witness.

(c) The administrative law judge presiding over a hearing in which testimony is taken pursuant to this section may clear the hearing room of any person in order to protect a witness from intimidation or other harm, taking into account the rights of all persons.