(As amended Feb. 28, 1966, eff. July 1, 1966; Apr. 24, 1972, eff. Oct. 1, 1972; Apr. 26 and July 8, 1976, eff. Aug. 1, 1976; Pub. L. 95–78, § 2(a), July 30, 1977, 91 Stat. 319; Apr. 30, 1979, eff. Aug. 1, 1979; Apr. 28, 1983, eff. Aug. 1, 1983; Pub. L. 98–473, title II, § 215(f), Oct. 12, 1984, 98 Stat. 2016; Apr. 29, 1985, eff. Aug. 1, 1985; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 22, 1993, eff. Dec. 1, 1993; Apr. 26, 1999, eff. Dec. 1, 1999; Pub. L. 107–56, title II, § 203(a), Oct. 26, 2001, 115 Stat. 278; Apr. 29, 2002, eff. Dec. 1, 2002; Pub. L. 107–296, title VIII, § 895, Nov. 25, 2002, 116 Stat. 2256; Pub. L. 108–458, title VI, § 6501(a), Dec. 17, 2004, 118 Stat. 3760; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 26, 2011, eff. Dec. 1, 2011; Apr. 25, 2014, eff. Dec. 1, 2014.)
