(a) Prohibition The President shall take all reasonable steps to ensure that assistance under this chapter and the Arms Export Control Act [
22 U.S.C.
2751 et seq.] is not provided to or through any individual or entity that the President knows or has reason to believe
(1) has been convicted of a violation of, or a conspiracy to violate, any law or regulation of the United States, a State or the District of Columbia, or a foreign country relating to narcotic or psychotropic drugs or other controlled substances; or
(2) is or has been an illicit trafficker in any such controlled substance or is or has been a knowing assistor, abettor, conspirator, or colluder with others in the illicit trafficking in any such substance.