Pub. L. 101-382, tit. III, subtit. A, pt. 1, sec. 409
CARFENTANIL CITRATE.
SEC. 409. CARFENTANIL CITRATE. Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: “ 9902.31.04 Carfentanil citrate (provided for in subheading 3004.90.60) Free No change No change On or before 12/31/92 ”