The National Minimum Drinking Age Act of 1984 (23 U.S.C. § 158) was passed by the United States Congress and was later signed into law by President Ronald Reagan on July 17, 1984. The act would punish any state that allowed persons under 21 years to purchase alcoholic beverages by reducing its annual federal highway apportionment by 10 percent. The law was later amended, lowering the penalty to 8 percent from fiscal year 2012 and beyond. The act was expressly upheld as constitutional in 1987 by the United States Supreme Court in South Dakota v. Dole.