(a) Part 20 of Article VIII of this Act does not apply to the records of patients, inmates, or persons being examined, observed or treated in any institution, division, program or service now existing, or hereafter acquired or created under the jurisdiction of the Department of Human Services as successor to the Department of Mental Health and Developmental Disabilities and the Department of Alcoholism and Substance Abuse, or over which, in that capacity, the Department of Human Services exercises executive or administrative supervision.
     (b) In the event of a conflict between the application of Part 20 of Article VIII of this Act and the Mental Health and Developmental Disabilities Confidentiality Act or subsection (bb) of Section 30-5 of the Substance Use Disorder Act to a specific situation, the provisions of the Mental Health and Developmental Disabilities Confidentiality Act or subsection (bb) of Section 30-5 of the Substance Use Disorder Act shall control. The provisions of federal law concerning the confidentiality of alcohol and drug abuse patient records, as contained in Title 21 of the United States Code, Section 1175; Title 42 of the United States Code, Section 4582; 42 C.F.R. part 2; and any other regulations promulgated pursuant thereto, all as now or hereafter amended, shall supersede all other laws and regulations concerning such confidentiality, except where any such otherwise applicable laws or regulations are more stringent, in which case the most stringent shall apply.