(As amended Feb. 28, 1966, eff. July 1, 1966; Apr. 24, 1972, eff. Oct. 1, 1972; Apr. 30, 1979, eff. Aug. 1, 1979; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 29, 2002, eff. Dec. 1, 2002; Pub. L. 108–21, title VI, § 610(b), Apr. 30, 2003, 117 Stat. 692; Mar. 26, 2009, eff. Dec. 1, 2009.)