Each such visit may include an inspection of every part of each establishment. The representatives of the department of health may make an examination of all records, methods of administration, the general and special dietary, the stores and methods of supply, and may cause an examination and diagnosis to be made of any person confined therein. The representatives of the department of health may examine to determine their fitness for their duties the officers, attendants, and other employees, and may talk with any of the patients apart from the officers and attendants.