(As amended Dec. 27, 1948, eff. Oct. 20, 1949; Apr. 9, 1956, eff. July 8, 1956; Apr. 24, 1972, eff. Oct. 1, 1972; Mar. 18, 1974, eff. July 1, 1974; Apr. 26 and July 8, 1976, eff. Aug. 1, 1976; Pub. L. 95–78, § 2(e), July 30, 1977, 91 Stat. 320, eff. Oct. 1, 1977; Apr. 30, 1979, eff. Aug. 1, 1979; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 25, 1989, eff. Dec. 1, 1989; May 1, 1990, eff. Dec. 1, 1990; Apr. 22, 1993, eff. Dec. 1, 1993; Pub. L. 107–56, title II, § 219, Oct. 26, 2001, 115 Stat. 291; Apr. 29, 2002, eff. Dec. 1, 2002; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 23, 2008, eff. Dec. 1, 2008; Mar. 26, 2009, eff. Dec. 1, 2009; Apr. 26, 2011, eff. Dec. 1, 2011; Apr. 28, 2016, eff. Dec. 1, 2016.)
