21 USC 802: Definitions Under the Controlled Substances Act

The definitions in 21 USC 802 are the interpretive backbone of the Controlled Substances Act. Every offense, registration requirement, and regulatory duty elsewhere in the CSA depends on the terms Section 802 defines: what a controlled substance is, who counts as a practitioner, what “manufacture” and “distribute” cover, and dozens of other terms that decide whether a given act is lawful or a federal felony.

Controlled Substance

A controlled substance is any drug, substance, or immediate precursor listed on one of the five federal schedules, I through V.¹ The inclusion of immediate precursors matters: the statute reaches beyond finished drugs to the chemical building blocks used to make them.

The definition expressly excludes distilled spirits, wine, malt beverages, and tobacco, which are regulated elsewhere.¹ Once a substance is scheduled, every activity involving it, from production through end-user delivery, falls under the CSA.

The five schedules run from Schedule I (high abuse potential, no accepted medical use, no accepted safe use even under medical supervision) down to Schedule V (lowest abuse potential, accepted medical use, limited dependence liability).² The Attorney General, through the DEA, can add, move, or remove substances after evaluating pharmacological effects, abuse history, and public health risk.³

Immediate Precursor

An immediate precursor is a substance the Attorney General has designated as (1) the principal compound used, or produced primarily for use, in making a controlled substance, (2) an immediate chemical intermediary in the manufacturing process, and (3) a substance whose control is necessary to prevent or limit that production.¹ All three requirements must be met. A chemical used somewhere in a multi-step synthesis is not automatically covered. Once designated, an immediate precursor falls under the same schedule-based controls as the drug it produces.

Marijuana and the Hemp Line

Under Section 802, “marihuana” covers all parts of the Cannabis sativa L. plant and every compound, derivative, or preparation made from it, but no longer includes hemp after the 2018 Agriculture Improvement Act.⁴ Hemp is Cannabis sativa L. with a delta-9 THC concentration of not more than 0.3 percent on a dry weight basis.⁵

That 0.3 percent threshold is the whole test. At or below it, the plant is hemp and falls outside the federal definition of marijuana. Above it, the plant remains marijuana on Schedule I. The marijuana definition also keeps a longstanding exclusion for mature stalks, fiber from those stalks, oil or cake made from seeds, and sterilized seeds incapable of germination.⁴

Controlled Substance Analogue

An analogue is a substance that is chemically similar to something on Schedule I or II, produces a similar stimulant, depressant, or hallucinogenic effect on the central nervous system, or is represented or intended to produce such an effect.¹ This is the federal answer to designer drugs engineered to skirt existing schedules.

An analogue is treated as a Schedule I substance only to the extent it is intended for human consumption. A “not for human consumption” label does not, by itself, defeat prosecution. Courts can consider marketing, pricing, distribution methods, and whether the seller knew or should have known the substance would be consumed.⁶

Narcotic Drug

The federal definition of “narcotic drug” is narrower than everyday usage suggests. It is limited to opium and its derivatives, coca leaves and cocaine (including salts, isomers, and related compounds such as ecgonine), poppy straw, and preparations containing these substances.¹ Marijuana, methamphetamine, and LSD are not narcotics under federal law. Because several CSA provisions impose heightened penalties specifically for narcotic drugs, the distinction changes exposure at sentencing.

Anabolic Steroid

An anabolic steroid is any drug or hormonal substance chemically and pharmacologically related to testosterone. Section 802 lists dozens of specific compounds and also covers their salts, esters, and ethers.¹ Anabolic steroids sit on Schedule III.

The definition excludes estrogens, progestins, corticosteroids, and dehydroepiandrosterone (DHEA), which is why DHEA supplements remain available over the counter. A catch-all pulls in unlisted substances derived from or structurally similar to a listed compound if they were created or marketed to promote muscle growth or mimic testosterone’s effects.

Manufacture, Production, and Distribute

“Manufacture” reaches far beyond synthesis in a lab. It covers any production, preparation, compounding, or processing of a drug, whether by chemical synthesis, extraction from natural sources, or a combination. It also covers packaging, repackaging, labeling, and relabeling of a controlled substance container.¹ Repackaging pills into smaller bags is manufacturing under this definition, even if nothing was created.

One carve-out matters: a licensed practitioner who compounds, packages, or labels a drug as part of dispensing it to a patient in the normal course of practice is not manufacturing.¹

“Production” is broader still. It includes manufacturing plus growing, cultivating, planting, or harvesting a controlled substance.¹ Anyone growing marijuana plants is engaged in production, whatever the scale.

“Distribute” means to deliver a controlled substance or listed chemical, other than by administering or dispensing it.¹ A pharmacist filling your prescription is dispensing, not distributing. Distribution describes the transfer of substances between regulated entities, such as a wholesaler supplying a pharmacy, or the unlawful transfer of drugs in trafficking.

Dispense, Administer, and Ultimate User

“Dispensing” means delivering a controlled substance to an ultimate user or research subject by, or under the lawful order of, a practitioner. It includes prescribing, administering, and the packaging, labeling, or compounding needed to prepare the substance for delivery.¹

“Administering” is the direct application of a controlled substance to the body of a patient or research subject, whether by injection, inhalation, ingestion, or any other method. Only a practitioner may administer, or the practitioner’s authorized agent in the practitioner’s presence. A patient may also self-administer at the practitioner’s direction and in their presence.¹

The “ultimate user” is the end of the lawful chain: a person who has lawfully obtained and possesses a controlled substance for their own use, for a household member’s use, or for an animal they or a household member owns.¹

Deliver

“Deliver” or “delivery” means the actual, constructive, or attempted transfer of a controlled substance or listed chemical, whether or not any agency relationship exists between the parties.¹ This is the broadest transfer term in Section 802. It covers a physical hand-off, directing someone else to pick up a package, and an unsuccessful attempt. Delivery is the underlying action for distributing, dispensing, and trafficking alike.

Practitioner and Agent

A “practitioner” is a physician, dentist, veterinarian, scientific investigator, pharmacy, hospital, or other person licensed or authorized by federal or state law to distribute, dispense, conduct research with, administer, or use a controlled substance in the course of professional practice or research.¹ State licensing alone is not enough. Practitioners must also register with the DEA to handle Schedule II through V substances, and research with Schedule I substances requires a separate registration and additional approval from the Secretary of Health and Human Services.⁷

An “agent” is someone authorized to act on behalf of a manufacturer, distributor, or dispenser. Common carriers and public warehousemen acting in the ordinary course of their business are not agents, even when they physically transport controlled substances.¹

Listed Chemicals

A “listed chemical” is any chemical the Attorney General has designated as one used to manufacture controlled substances illegally, and the statute splits them into two tiers.¹ List I chemicals are those the Attorney General has determined are important to the manufacturing process, including ephedrine, pseudoephedrine, ergotamine, and safrole. List II chemicals are used in drug manufacturing but not classified as List I, and tend to be common industrial solvents and reagents such as acetone, ethyl ether, and acetic anhydride.

A “regulated transaction” involving listed chemicals includes any sale, distribution, import, or export at or above thresholds set by the Attorney General. Routine common-carrier shipments and sales of approved over-the-counter medications generally fall outside the definition unless the Attorney General has found a particular product is being diverted.

Online Pharmacy

An “online pharmacy” is any person, entity, or website that knowingly delivers, distributes, or dispenses a controlled substance by means of the internet.⁸ This term was added by the Ryan Haight Online Pharmacy Consumer Protection Act of 2008, which requires at least one in-person medical evaluation before a controlled substance may be prescribed over the internet, with exceptions for telemedicine, covering practitioners, and certain registered pharmacies that only refill existing prescriptions for Schedule III through V substances.⁹

Registered pharmacies that dispense Schedule III through V refills online, or that fill new prescriptions for established patients where the original prescription followed an in-person evaluation, are excluded from the online pharmacy definition and its extra regulatory burdens.⁸ Entities that do not fit an exception must register separately with the DEA and meet disclosure requirements, including posting their registration information on their website.

1
Office of the Law Revision Counsel. 21 USC 802 – Definitions
2
Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances
3
Office of the Law Revision Counsel. 21 USC Chapter 13, Subchapter I, Part B – Authority To Control; Standards and Schedules
4
Legal Information Institute. Definition – Marihuana from 21 USC 802(16)
5
DEA Diversion Control Division. Controlled Substances Q&A
6
Office of the Law Revision Counsel. 21 U.S. Code 813 – Treatment of Controlled Substance Analogues
7
Office of the Law Revision Counsel. 21 USC 823 – Registration Requirements
8
Office of the Law Revision Counsel. 21 U.S. Code 802 – Definitions
9
U.S. Department of Justice. Ryan Haight Online Pharmacy Consumer Protection Act of 2008