For most of the last decade, the legal status of CBD rested on a single number: 0.3 percent delta-9 THC. That number is changing. A 2025 federal law changes the hemp definition starting in late 2026; check current federal and state rules before you buy, sell or travel with CBD. This guide explains where the old rule came from, what has been reported about the new one, and why a beginner should treat any article about hemp law, including this one, as a starting point, not the final word.
Not legal advice
This is general information about a changing area of law, written for consumers. It is not legal advice. For questions about your situation, consult a licensed attorney in your state, and check official federal and state sources for the current rules.
The 2018 Farm Bill Created Today's Hemp Market
The Agriculture Improvement Act of 2018, usually called the 2018 Farm Bill, defined hemp as cannabis with no more than 0.3 percent delta-9 THC on a dry weight basis and removed hemp from the federal Controlled Substances Act. That one definition is why CBD products appeared in grocery stores, pharmacies and gas stations across much of the country. It did not make every hemp product lawful in every form: the FDA kept authority over foods, supplements and drugs, and states kept the power to write their own rules.
The definition also had a gap. Because it measured only delta-9 THC, products containing other intoxicating compounds, and products whose THC showed up mostly as THCA, could fit inside the hemp definition on paper. Lawmakers and regulators spent years debating how to close that gap.
What the 2025 Federal Law Changes
In November 2025, a federal funding law (H.R. 5371) included a new definition of hemp. As widely reported, it makes three changes that matter to CBD buyers:
- Total THC, not just delta-9. The 0.3 percent limit is measured as total THC on a dry weight basis, which counts THCA and similar forms, not delta-9 THC alone.
- A per-container cap. Finished products are limited to 0.4 milligrams of total THC per container.
- No synthesized cannabinoids. Cannabinoids that are synthesized or made outside the plant are excluded from the hemp definition.
The per-container cap is the part most likely to affect ordinary CBD shoppers. Many full-spectrum products have been made to stay under 0.3 percent THC by weight, but a whole bottle can still contain more than 0.4 milligrams of THC in total. Products like that may no longer fit the federal hemp definition once the change applies. Broad-spectrum and isolate products with THC below detectable levels are less exposed, though each product depends on its own lab results.
Why Reported Dates Differ
Most sources give November 12, 2026 as the date the new definition takes effect. At least one law firm has reported that the total THC and per-container parts moved to December 11, 2026, while the exclusion of synthesized cannabinoids kept the November date. Further legislation or agency guidance could change the picture again. This site does not treat any single date as settled. The safe position for a buyer is simple: a 2025 federal law changes the hemp definition starting in late 2026; check current federal and state rules.
State Rules Still Decide a Lot
Federal law sets the outer boundary. States can be stricter, and many are. State rules can cover minimum purchase ages, labeling and testing requirements, where products may be sold, and outright bans on certain product types. Some states regulate hemp products through their agriculture department, some through health or cannabis agencies. Before buying, look up your state's current rules on an official state website, not a seller's page. If you travel, check the destination too; carrying a product across a state or national border can change its legal status.
Where to check, in general terms
| Question | Usually answered by |
|---|
| Is this product hemp under federal law? | Federal statute and USDA guidance, plus the batch lab report |
|---|
| Can it be sold where I live? | Your state's agriculture, health or cannabis regulator |
|---|
| Can it be marketed as food or a supplement? | The FDA, and your state's food safety rules |
|---|
| Can I carry it on a trip? | Rules at your destination and any border you cross |
|---|
What a Beginner Should Do Now
Read the THC section of the lab report more carefully than before. Look for total THC, not only delta-9, and work out the total per container from the per-serving or per-gram figure. Our label and COA guide shows how. Be cautious about stocking up on products that might not meet the new definition, and expect some products and sellers to change or disappear. If you face drug testing, the drug testing guide matters more than ever. Then work through the beginner checklist, which includes a check for your state's rules.
