TL;DR – CBD from hemp is federally legal in the U.S. because the 2018 Farm Bill redefined hemp as cannabis containing no more than 0.3% delta-9 THC and removed it from the Controlled Substances Act. Marijuana remains a Schedule I controlled substance under federal law because it contains higher concentrations of THC. The key difference is THC content, not the plant itself — both hemp and marijuana come from the same species, Cannabis sativa L.
The Same Plant, Two Very Different Legal Outcomes
One of the most common questions people ask when they first encounter CBD is why it appears to be legal when marijuana is not. After all, both CBD and THC come from the cannabis plant. The answer lies in how federal law draws a line between hemp and marijuana, and what that distinction means for the cannabinoids derived from each.
Hemp and marijuana are not separate species in the botanical sense. They are both Cannabis sativa L., the same plant. What distinguishes them legally is not genetics, morphology, or any deep biological difference — it is THC concentration. The Agricultural Improvement Act of 2018, commonly called the 2018 Farm Bill, defined hemp as cannabis with no more than 0.3% delta-9 tetrahydrocannabinol (THC) on a dry weight basis. Any cannabis plant exceeding that threshold is classified as marijuana and remains a Schedule I controlled substance under the Controlled Substances Act.
CBD (cannabidiol) is a cannabinoid found in both hemp and marijuana. When extracted from hemp that meets the 0.3% THC threshold, CBD is legal under federal law. When extracted from marijuana, CBD carries the same legal status as marijuana itself, regardless of how little THC it contains. The source plant — not the CBD molecule — determines legality.
A Brief History of Cannabis Prohibition in the United States
To understand why this distinction matters, it helps to look at how cannabis prohibition came about in the first place. The Marihuana Tax Act of 1937 was the first major federal law restricting cannabis. It did not technically make marijuana illegal but imposed burdensome taxes and regulations that effectively ended commercial cannabis production. At the time, hemp was widely grown for fiber and seed, and the law created significant confusion about its status.
The modern framework was established by the Controlled Substances Act of 1970, which classified marijuana as a Schedule I substance — meaning the federal government considered it to have no accepted medical use and a high potential for abuse. Critically, the 1970 Act made no meaningful legal distinction between hemp and marijuana. All cannabis was treated as marijuana for purposes of federal law, which effectively ended legitimate hemp farming in the United States for decades.
That began to change with the Agricultural Act of 2014, which allowed universities and state departments of agriculture to grow hemp for research purposes under pilot programs. But it was the 2018 Farm Bill that made the comprehensive change, formally removing hemp from the Controlled Substances Act and establishing the current legal framework.
What the 2018 Farm Bill Actually Changed
The Agricultural Improvement Act of 2018 (Pub. L. No. 115-334) made several significant changes to U.S. law regarding cannabis. First, it amended the Controlled Substances Act to explicitly exclude hemp from the definition of marijuana. Hemp, defined as cannabis with no more than 0.3% delta-9 THC on a dry weight basis, was removed from Schedule I entirely. This was not a small regulatory tweak — it was a categorical change in federal classification.
Second, the 2018 Farm Bill established a federal framework for hemp production, giving states the ability to submit hemp plans to the U.S. Department of Agriculture for approval. States that did not submit plans could operate under a USDA federal plan. The law created licensing requirements, mandatory testing, and a chain of custody for hemp from seed to sale.
Third, the law explicitly legalized the interstate transport of hemp and hemp-derived products, including CBD oil. This was essential for creating a national market. Prior to 2018, even transporting hemp across state lines was technically a federal crime.
What the Farm Bill did not change is the status of marijuana. Cannabis exceeding 0.3% THC remains Schedule I under the Controlled Substances Act. That federal classification persists even as dozens of states have legalized marijuana for medical or recreational use at the state level, creating a complex patchwork of state and federal law.
Why THC Is the Legal Dividing Line
You might wonder why 0.3% was chosen as the threshold. The figure originates from a 1976 report by Canadian botanist Ernest Small, who proposed it as a practical way to distinguish hemp varieties from drug varieties of cannabis. There is nothing pharmacologically magical about 0.3% — it is simply a threshold low enough that hemp products do not produce psychoactive effects.
THC is the primary psychoactive compound in cannabis. It binds to CB1 receptors in the brain and central nervous system, producing the characteristic “high” associated with marijuana use. Hemp-derived CBD products, by definition, contain negligible amounts of THC — nowhere near enough to produce intoxication. CBD itself does not bind to CB1 receptors in the same way THC does and is not considered psychoactive in the traditional sense.
Because hemp CBD products contain so little THC, Congress concluded that they did not present the same concerns that drove marijuana prohibition. The regulatory decision was essentially pragmatic: hemp is a versatile agricultural commodity with industrial, nutritional, and wellness applications, and its low THC content means it cannot meaningfully be used to get high. Removing it from Schedule I allowed a legitimate agricultural and commercial industry to develop without meaningful drug abuse risk.
The Role of the FDA and Remaining Federal Restrictions
The 2018 Farm Bill resolved the DEA and Controlled Substances Act questions around hemp CBD, but it did not create a free-for-all. The U.S. Food and Drug Administration retained authority to regulate CBD in food, beverages, and dietary supplements. The FDA has taken the position that because CBD was first studied as a drug ingredient (it was already the subject of Investigational New Drug applications when the Farm Bill passed), it cannot be added to food or dietary supplements without further regulatory action.
The FDA has approved one CBD-based medication, Epidiolex, for treatment-resistant seizure disorders. This is a pharmaceutical-grade prescription product and is subject to full FDA drug approval requirements. Epidiolex’s approval actually complicated the dietary supplement pathway somewhat, reinforcing the FDA’s position that CBD is a drug ingredient rather than a supplement ingredient.
In practice, the FDA has taken a restrained enforcement approach toward the broader CBD supplement market. The agency has focused enforcement on companies making disease treatment claims and on products with significant safety concerns. Hemp CBD oils, gummies, and topicals continue to be sold widely without FDA interference in most cases. However, the regulatory framework remains unsettled, and the FDA could take a more active role at any time.
State Law Variation Adds Complexity
Even with a clear federal framework for hemp CBD, state laws vary. Most states have aligned with the federal definition and created their own hemp programs, making CBD widely accessible. However, a handful of states have imposed additional restrictions. Some states have banned specific hemp-derived cannabinoids like delta-8 THC. Others have required additional labeling or testing beyond federal minimums.
Marijuana law at the state level has also been evolving rapidly. As of 2026, more than half of U.S. states have legalized marijuana for adult recreational use, and most states have medical marijuana programs. But state legalization does not change federal law — marijuana remains Schedule I federally, which has implications for banking, employment, federal benefits, and interstate commerce involving marijuana products.
The result is a genuinely complex legal landscape where the same plant can be legal, illegal, or somewhere in between depending on its THC content, the state you are in, whether you are on federal property, and what specific use is being considered.
What This Means for Consumers
For most consumers, the practical takeaway is simple: hemp-derived CBD products with no more than 0.3% THC are federally legal and available without a prescription across the country. The science behind why CBD and marijuana are treated differently comes down to THC content, which Congress chose as the defining line between agricultural hemp and controlled marijuana.
When you purchase a CBD product, the most important verification step is confirming its THC content through a third-party Certificate of Analysis. A reputable brand will always provide a COA that shows both the CBD content and the delta-9 THC level, confirming the product is within the legal threshold. New Phase Blends publishes COAs for all of its products for exactly this reason — transparency about what is in the product and proof that it complies with federal law.
If you have questions about how CBD affects the body, how to choose a product, or what serving size might be appropriate for your goals, speaking with a healthcare provider who is knowledgeable about hemp-derived cannabinoids is always a good idea.
Frequently Asked Questions
Is CBD from marijuana legal?
No, not at the federal level. CBD extracted from marijuana — cannabis with more than 0.3% THC — carries the same federal Schedule I status as marijuana itself. It may be legal at the state level in states with medical or recreational marijuana programs, but it is not federally legal in the way hemp-derived CBD is.
Does CBD get you high?
Hemp-derived CBD does not produce intoxication. CBD does not bind to CB1 receptors in the brain the same way THC does, and the negligible amount of THC in compliant hemp products (0.3% or less) is not sufficient to produce psychoactive effects. Many people report that CBD has calming or relaxing properties, but this is distinct from the impairment associated with marijuana use.
Can CBD show up on a drug test?
Standard drug tests screen for THC metabolites, not CBD. However, full-spectrum hemp CBD products do contain trace amounts of THC, and in some cases heavy or prolonged use could potentially lead to a positive result. Broad-spectrum CBD (THC-free) and CBD isolate products carry much lower risk in this regard. If drug testing is a concern, choosing a product verified to contain non-detectable THC levels is the safest approach.
Why does the 0.3% THC threshold matter?
The 0.3% threshold is the legal dividing line between hemp and marijuana under federal law. Below 0.3% delta-9 THC, the cannabis plant is classified as hemp and is legal to grow, process, and sell. Above 0.3%, it is classified as marijuana and remains a Schedule I controlled substance at the federal level.
Will marijuana ever be federally legal?
Federal marijuana legalization has been debated in Congress for years. Various bills have been introduced, and discussions around rescheduling marijuana from Schedule I to Schedule III have advanced at the DEA level. However, as of this writing, marijuana remains federally illegal. The landscape is evolving, and significant changes could occur in the coming years.
References
Agricultural Improvement Act of 2018, Pub. L. No. 115-334, 7 U.S.C. § 1639o (2018). Hemp farming. https://www.congress.gov/bill/115th-congress/house-bill/2
Controlled Substances Act, 21 U.S.C. § 801 et seq. (1970). Schedule I substances. https://www.dea.gov/drug-information/csa
Small, E., & Cronquist, A. (1976). A practical and natural taxonomy for cannabis. Taxon, 25(4), 405–435. https://doi.org/10.2307/1220524
U.S. Food and Drug Administration. (2023). FDA regulation of cannabis and cannabis-derived products, including cannabidiol (CBD). https://www.fda.gov/news-events/public-health-focus/fda-regulation-cannabis-and-cannabis-derived-products-including-cannabidiol-cbd
U.S. Drug Enforcement Administration. (2020). Implementation of the Agriculture Improvement Act of 2018. 85 Fed. Reg. 51639. https://www.federalregister.gov/documents/2020/08/21/2020-17356/implementation-of-the-agriculture-improvement-act-of-2018
