...Act), or narcotic drug (as defined in section 4731(a) of the Internal Revenue Code of 1954), or (4) has been adjudicated as a mental defective or who has been committed to a mental institution. (b) A firearm may not be received, possessed, or transported in commerce or affecting commerce by any...

...802(9))), or a narcotic drug (as defined in section 2715(10) of 17 title 18, United States Code); or 18 (4) who has been adjudicated as a mental defective or who has been 19 committed to a mental institution; 20 to ship or transport any explosive in interstate or foreign...