Cal. Bus. & Prof. Code § 11328.1
If the director has a reasonable belief that a registrant, or person or entity acting in a capacity that requires a certificate of registration, has engaged in activities prohibited under this part, the director may submit a written request to the registrant, person, or entity, requesting copies of written material related to the director's investigation. Any registrant, person, or entity receiving a written request from the director for information related to an investigation of prohibited activities shall submit that information to the director or the bureau within a reasonable period of time, which shall be specified by the director in the written request. Any material submitted shall be kept confidential by the director and the bureau.
Ca. Bus. and Prof. Code § 11328.1