Cal. Code Regs. tit. 17, § 1159
Anyone who files a complaint to the department against an individual, or person, violating this law shall supply in writing specific information regarding the alleged violation, or violations. Such complaint shall include the time, date, place, individual, or person involved; and the names of other witnesses who may be called to testify. This statement must be in the form of a sworn affidavit and must be notarized.