The Department of Public Health shall, whenever possible, conduct dual inspections of chronic and convalescent nursing homes or rest homes with nursing supervision when an inspection of such a facility is necessary for the purpose of the facility’s maintaining state licensure and certification for participation in the Title XIX Medicaid program or the Title XVIII Medicare program, provided such dual inspections shall be conducted in not less than fifty per cent of such facilities. On and after January 1, 1993, the department shall conduct such dual inspections in not less than seventy per cent of such facilities. On and after June 3, 2003, such dual inspections shall not be disclosed to such facility before such inspection and shall be conducted on a random basis, as to date and time of day.