California Code, Health and Safety Code - HSC § 1569.511

(a) The administrative law judge conducting a hearing under this article may permit the testimony of a child witness, or a similarly vulnerable witness, including a witness who is developmentally disabled, to be taken outside the presence of the respondent or respondents if all of the following conditions exist:

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

(c) The administrative law judge conducting a hearing under this section may clear the hearing room of any persons who are not a party to the action in order to protect any witness from intimidation or other harm, taking into account the rights of all persons.