Quick answer: On November 12, 2025, President Trump signed Public Law 119-37, which redefines federal "hemp." Starting November 12, 2026, hemp will be capped at 0.3% total THC (not just delta-9) on a dry-weight basis, plus a 0.4 mg total-THC-per-container cap on finished consumer products. The Farm Bill loophole that made high-potency THCa, delta-8, and delta-10 federally legal is closing.
This article explains the law in plain English, walks through the math, and tells you what it means for THCa flower, concentrates, vapes, edibles, and the brands you've come to trust.
Table of contents
- What P.L. 119-37 actually says
- The two changes that matter
- How to calculate "total THC"
- What this means for THCa products
- State law still applies — what about Maine?
- What's NOT changing
- Timeline: what happens between now and November 12, 2026
- Frequently asked questions
- What Mainely Meltz is doing about it
What P.L. 119-37 actually says
Public Law 119-37 (also called the FY2026 Agriculture Appropriations Act) is a federal spending bill passed by Congress and signed by President Trump on November 12, 2025. The hemp provisions are tucked inside Division B, Section 781.
That section amends 7 U.S.C. § 1639o — the federal hemp definition originally set by the 2018 Farm Bill. The amendment narrows the definition of hemp in two important ways and gives the industry a one-year transition window. The new rules take effect November 12, 2026 (365 days after signing).
There is no grandfather clause for existing inventory, no phase-out for products in transit, and no safe harbor for anything already manufactured.
The two changes that matter
1. From "delta-9 THC only" to "total THC"
The 2018 Farm Bill defined hemp as cannabis containing no more than 0.3% delta-9 THC on a dry-weight basis. P.L. 119-37 changes that to 0.3% total THC — meaning delta-9 THC plus the THC that THCa converts into when heated.
Why this matters: THCa flower can test below 0.3% delta-9 (because THCa is the non-decarboxylated precursor) while carrying 20–30%+ THCa that becomes psychoactive when smoked, vaped, or dabbed. Under the new total-THC standard, that same flower no longer qualifies as hemp.
2. The 0.4 mg total-THC-per-container cap
Even if a finished product somehow stayed under the 0.3% total-THC threshold by weight, P.L. 119-37 adds a hard ceiling on the absolute amount of THC per container: 0.4 milligrams.
To put 0.4 mg in perspective:
- A typical 10 mg hemp THC gummy is 25× the new cap
- A 1 g THCa concentrate at 60% total THC contains 600 mg — 1,500× the cap
- A 7 g THCa flower jar at 20% total THC contains 1,400 mg — 3,500× the cap
The cap effectively closes the entire intoxicating-hemp category at the federal level.
How to calculate "total THC"
The standard formula:
Total THC % = Δ9-THC % + (0.877 × THCA %)
The 0.877 factor accounts for the molecular weight loss when THCa decarboxylates to delta-9 THC (roughly 12.3% of the THCa molecule is the carboxylic acid group that leaves as CO₂ when heated).
Example: a typical Mainely Meltz concentrate
- THCA: 77.5%
- Δ9-THC: 0.0% (ND)
- Total THC = 0.0 + (0.877 × 77.5) = 67.9%
Under the current Farm Bill, this product is hemp because Δ9-THC is below 0.3%. Under P.L. 119-37, this product would not be hemp because total THC is far above 0.3%.
This formula is also how Maine's MCR Labs (and most accredited labs) report Total THC on every COA — you can already see it on your favorite product's lab report.
What this means for THCa products
| Category | Current status | After Nov 12, 2026 |
|---|---|---|
| THCa flower (>0.3% total THC) | Federally legal hemp | No longer federal hemp |
| THCa concentrates / hash / rosin | Federally legal hemp | No longer federal hemp |
| THCa pre-rolls | Federally legal hemp | No longer federal hemp |
| Live resin disposables | Federally legal hemp | No longer federal hemp |
| Hemp THC edibles >0.4 mg per container | Federally legal hemp | No longer federal hemp |
| Hemp THC beverages >0.4 mg per container | Federally legal hemp | No longer federal hemp |
| CBD-only products with trace THC under both thresholds | Federally legal hemp | Federally legal hemp |
| Industrial hemp (fiber, grain, seed, hempcrete) | Federally legal hemp | Federally legal hemp |
The U.S. Hemp Roundtable estimates the law eliminates approximately 95% of existing hemp-derived cannabinoid products, an industry generating roughly $28 billion in annual U.S. retail sales.
State law still applies — what about Maine?
Federal hemp law and state cannabis law are two different things. Even after November 12, 2026, individual states can still regulate, allow, or prohibit cannabis products under their own frameworks.
Maine has a comprehensive adult-use cannabis program for adults 21 and over. Many products affected by P.L. 119-37 may continue to be legal in Maine through the state's licensed cannabis channels — but the federal classification, interstate shipping eligibility, and access to federally regulated payment processing all change.
In practice:
- Shipping THCa products into Maine from out-of-state becomes federally restricted in ways it isn't today
- Brands that operate exclusively under hemp law lose the ability to sell intoxicating products through hemp channels
- State-licensed cannabis operators continue under state law
- Hemp businesses pivoting to state programs is the most common industry response
Other states are reacting differently — California, Colorado, Tennessee, and others have already passed or are debating their own state-level total-THC laws or hemp restrictions. Always check current state law before ordering, and expect the legal landscape to shift over the next 12 months.
What's NOT changing
P.L. 119-37 does not:
- Reschedule or legalize cannabis at the federal level
- Affect state-licensed adult-use or medical cannabis programs
- Outlaw industrial hemp (fiber, grain, hempcrete, hemp seed, hemp oil)
- Outlaw non-intoxicating CBD products that fit within both thresholds
- Take effect immediately — there is a 365-day transition window
- Apply to products manufactured AND sold before November 12, 2026
It does not ban THCa as a molecule. It changes how the federal government classifies products containing THCa.
Timeline: what happens between now and November 12, 2026
| Date | What happens |
|---|---|
| November 12, 2025 | President signs P.L. 119-37 |
| November 2025 – November 2026 | Federal hemp law unchanged; THCa products legal under existing 2018 Farm Bill rules |
| Spring 2026 | USDA expected to publish guidance on testing protocols for the new total-THC standard |
| Summer–Fall 2026 | Industry shifts to state cannabis programs, reformulation, sell-through, or pivot |
| November 12, 2026 | New definition takes effect. Products exceeding 0.3% total THC or 0.4 mg total THC per container are no longer federal hemp |
| 2027 onward | Enforcement scale-up by USDA, FDA, and DOJ; ongoing state-level legislation |
Frequently asked questions
Will my favorite Mainely Meltz products still be available after November 12, 2026?
In their current form, no — most THCa concentrates, flower, and disposables in our catalog will exceed both the new 0.3% total-THC and 0.4 mg per-container thresholds. We're working through inventory plans, reformulation options, and Maine-channel partnerships now. Sign up for our newsletter for updates as the timeline gets closer.
Is P.L. 119-37 a "ban" on hemp?
It's not a ban on hemp. It's a redefinition that excludes the high-potency THCa, delta-8, delta-10, and intoxicating edibles/beverages categories from the federal hemp framework. Industrial hemp and non-intoxicating CBD products that meet both thresholds remain federal hemp.
What's the math on the 0.4 mg per-container cap?
0.4 mg total THC per finished container, regardless of container size. That's the absolute limit. A standard 10 mg hemp gummy exceeds it by 25×. A 1 g concentrate at any meaningful potency exceeds it by 1,000–2,000×.
Does this affect drug testing?
No. Drug tests detect THC metabolites regardless of source (hemp vs marijuana vs synthetic). Anyone subject to drug testing should not consume THCa products before or after November 2026.
Can I stockpile products now?
There is no grandfather clause. Products purchased before November 12, 2026 don't become illegal to possess in states where cannabis is legal — but federal classification changes for the products themselves on that date. Shipping, transport across state lines, and federal payment processing all change.
What happens to lab COAs after November 12, 2026?
COAs continue to be valid documentation of cannabinoid content. Labs will likely highlight Total THC more prominently and add product-level mg calculations to make compliance with the per-container cap easy to verify. Mainely Meltz publishes Total THC on every product page already — see any product for an example.
Will THCa be legal anywhere?
THCa products are expected to remain legal through state-licensed cannabis programs in legal-cannabis states (Maine, Massachusetts, New York, Vermont, Connecticut, Rhode Island, and many others). The product won't disappear — it will move from hemp channels to state cannabis channels.
Where can I read the actual law?
Full text of P.L. 119-37 is published on Congress.gov: PLAW-119publ37.pdf. The hemp provisions are in Division B, Section 781.
What Mainely Meltz is doing about it
We've already started preparing for the transition:
- Lab data on every product page. Every Mainely Meltz product now publishes Total THC %, batch number, lab name, and lab date — so you can independently verify compliance against either the current or upcoming standard.
- Inventory planning. We're managing 2026 sourcing with the November 12 deadline in mind to minimize stranded inventory.
- Maine-channel partnerships. We're evaluating partnerships with Maine-licensed adult-use operators so customers can continue accessing the brands and strains they trust.
- Customer communication. Newsletter subscribers will get the earliest notice on product changes, pre-deadline drops, and post-deadline channel updates.
If you have questions about a specific product or batch, reach out and we'll respond within 24 hours.
Sources
This article is based on the following primary and analytical sources. We encourage cross-referencing.
- Public Law 119-37, full text (Congress.gov)
- Congressional Research Service: Changes to the Statutory Definition of Hemp
- CRS: Change to Federal Definition of Hemp and Implications for Federal Enforcement
- Arnold & Porter: Continuing Resolution Introduces Major Changes to Federal Regulation of Hemp-Derived Products
- Frier Levitt: Federal Hemp Redefinition — 2026 THC Limits & Compliance Risks
- Womble Bond Dickinson: Navigating New Hemp Laws
- The FDA Law Blog: Changes to "Hemp" Definition Set to Close the Farm Bill Loophole
- Journal of Medical Toxicology: Redefining Hemp — Public Law 119-37 and the Future of Cannabinoid Products
This post is for educational purposes only and does not constitute legal, medical, or business advice. Cannabis regulation evolves quickly. For specific compliance, business, or legal questions about how P.L. 119-37 applies to your situation, consult a qualified cannabis attorney. For product-specific questions, contact Mainely Meltz.
