(As amended Feb. 28, 1966, eff. July 1, 1966; Apr. 22, 1974, eff. Dec. 1, 1975; Pub. L. 94–64, § 3(20)–(28), July 31, 1975, 89 Stat. 374, 375; Pub. L. 94–149, § 5, Dec. 12, 1975, 89 Stat. 806; Apr. 28, 1983, eff. Aug. 1, 1983; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 22, 1993, eff. Dec. 1, 1993; Apr. 29, 1994, eff. Dec. 1, 1994; Apr. 11, 1997, eff. Dec. 1, 1997; Apr. 29, 2002, eff. Dec. 1, 2002; Pub. L. 107–273, div. C, title I, § 11019(b), Nov. 2, 2002, 117 Stat. 1825; Apr. 16, 2013, eff. Dec. 1, 2013.)