Dorsen successfully argued the case of "In re Gault", 387 U.S. 1 (1967), before the U.S. Supreme Court which held that juveniles accused of crimes in a delinquency proceeding must be afforded many of the same due process rights as adults. He argued Supreme Court cases "Levy v. Louisiana" (1968), ensuring equal protection for out-of-wedlock children, and "United States v. Vuitch" (1971), the first abortion case to reach the Court.