The Department of Health and Human Services is authorized to inspect residents' records maintained at the facility when necessary to investigate any alleged violation of the declaration of the residents' rights. The Department of Health and Human Services shall maintain the confidentiality of all persons who register complaints with the Department of Health and Human Services and of all records inspected by the Department of Health and Human Services. (1981, c. 923, s. 1; 1997-443, s. 11A.118(a).)