California Code, Government Code - GOV § 68097.9

An employee of the Department of Justice who is a peace officer or an analyst in a technical field, peace officer of the Department of the California Highway Patrol, peace officer member of the State Fire Marshal's office, sheriff, deputy sheriff, marshal, deputy marshal, firefighter, or city police officer who has been subpoenaed pursuant to Section 68097.1, 68097.3, or 68097.6, may, in lieu of attendance at the time specified in the subpoena, agree with the party at whose request the subpoena was issued to appear at another time or pursuant to notice as may be agreed upon.