The department may require anybody having knowledge of the business of any person who is subject to its jurisdiction, or having the custody of the books, accounts, and papers of that person, to attend before it and bring with him or her for inspection any books, accounts, or papers of that person in his or her possession and under his or her control, and to testify under oath touching any matter relating to the organization or business of that person.
Ca. Gov. Code § 15570.80