Welfare and Institutions Code § 10852

All persons who are subject to investigation or supervision by the department, or who are connected with any institution subject to such investigation or supervision, or who are in any way responsible for the administration or expenditure of funds which are subject to investigation or supervision by the department, shall furnish to the department such information and statistics as it may request or require, and shall allow the department free access to all such institutions and to all records of such institutions and persons.