42 U.S.C. § 148

“Notwithstanding the provisions of section 401(c)(2) of the Public Health Service Act (42 U.S.C. 281(c)(2)), the Secretary of Health and Human Services may not merge the National Institute on Alcohol Abuse and Alcoholism, the National Institute on Drug Abuse or the National Institute of Mental Health with any other institute or entity (or with each other) within the national research institutes for a 5-year period beginning on the date of enactment of this Act [July 10, 1992].