21 U.S. Code § 863 - Drug paraphernalia
(a) In general
It is unlawful for any person—
(2) to use the mails or any other facility of interstate commerce to transport drug paraphernalia; or
Anyone convicted of an offense under subsection (a) of this section shall be imprisoned for not more than three years and fined under title 18.
(c) Seizure and forfeiture
Any drug paraphernalia involved in any violation of subsection (a) of this section shall be subject to seizure and forfeiture upon the conviction of a person for such violation. Any such paraphernalia shall be delivered to the Administrator of General Services, General Services Administration, who may order such paraphernalia destroyed or may authorize its use for law enforcement or educational purposes by Federal, State, or local authorities.
(d) “Drug paraphernalia” defined
The term “drug paraphernalia” means any equipment, product, or material of any kind which is primarily intended or designed for use in manufacturing, compounding, converting, concealing, producing, processing, preparing, injecting, ingesting, inhaling, or otherwise introducing into the human body a controlled substance, possession of which is unlawful under this subchapter. It includes items primarily intended or designed for use in ingesting, inhaling, or otherwise introducing marijuana,  cocaine, hashish, hashish oil, PCP, methamphetamine, or amphetamines into the human body, such as—
(1) metal, wooden, acrylic, glass, stone, plastic, or ceramic pipes with or without screens, permanent screens, hashish heads, or punctured metal bowls;
(5) roach clips: meaning objects used to hold burning material, such as a marihuana cigarette, that has become too small or too short to be held in the hand;
(e) Matters considered in determination of what constitutes drug paraphernalia
In determining whether an item constitutes drug paraphernalia, in addition to all other logically relevant factors, the following may be considered:
(5) whether the owner, or anyone in control of the item, is a legitimate supplier of like or related items to the community, such as a licensed distributor or dealer of tobacco products;
(6) direct or circumstantial evidence of the ratio of sales of the item(s) to the total sales of the business enterprise;
This section shall not apply to—
(1) any person authorized by local, State, or Federal law to manufacture, possess, or distribute such items; or
 So in original. Probably should be “marihuana,”.
Source(Pub. L. 91–513, title II, § 422, as added and amended Pub. L. 101–647, title XXIV, § 2401(a)–(c), Nov. 29, 1990, 104 Stat. 4858, 4859; Pub. L. 106–310, div. B, title XXXVI, § 3614,Oct. 17, 2000, 114 Stat. 1230.)
The text of section 857 (b) to (f) of this title, which was transferred to subsecs. (b) to (f) of this section by Pub. L. 101–647, § 2401(b), was based on Pub. L. 99–570, title I, § 1822(b)–(f), Oct. 27, 1986, 100 Stat. 3207–51; Pub. L. 100–690, title VI, § 6485,Nov. 18, 1988, 102 Stat. 4384.
2000—Subsec. (d). Pub. L. 106–310inserted “methamphetamine,” after “PCP,” in introductory provisions.
1990—Subsec. (b). Pub. L. 101–647, § 2401(c)(1), substituted “fined under title 18” for “fined not more than $100,000”.
Pub. L. 101–647, § 2401(b), redesignatedsubsec. (b) ofsection 857 of this title as subsec. (b) of this section. See Codification note above.
Subsecs. (c) to (e). Pub. L. 101–647, § 2401(b), redesignatedsubsecs. (c) to (e) ofsection 857 of this title as subsecs. (c) to (e) of this section. See Codification note above.
Subsec. (f). Pub. L. 101–647, § 2401(c)(2), made technical amendment to reference to “This section” to correct reference to corresponding provision of original act.