Delta-8, Delta-9 & THCA — A Field Guide

Last verified: April 2026

The Federal Definition That Built the Loophole

The Agriculture Improvement Act of 2018 (the “2018 Farm Bill”) defined hemp as “the plant Cannabis sativa L. and any part of that plant, including the seeds thereof and all derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers, whether growing or not, with a delta-9 tetrahydrocannabinol concentration of not more than 0.3 percent on a dry weight basis.” That single sentence — delta-9 THC ≤ 0.3% by dry weight — is the entire federal threshold.

NC mirrored the federal language in N.C.G.S. § 90-87(13a). Session Law 2022-32 (SB 455, signed June 30, 2022) permanently excluded hemp and hemp-derived products from NC’s controlled-substances framework under § 90-87 and § 90-94. There is no state minimum age, potency cap, labeling rule, or licensing requirement.

Hemp is defined as the plant Cannabis sativa L. … with a delta-9 tetrahydrocannabinol concentration of not more than 0.3 percent on a dry weight basis.

Agriculture Improvement Act of 2018, § 10113 (codified at 7 U.S.C. § 1639o)

The Product Classes

Because the federal threshold is keyed only to delta-9 THC by dry weight, an entire ecosystem of intoxicating cannabinoids has emerged that either are not delta-9 (different isomer or analogue) or pass the dry-weight test through formulation (large-volume edibles and beverages). Most are produced by chemically converting CBD or other hemp inputs.

Delta-8 THC

A semi-synthetic isomer of delta-9 THC produced by acid-catalyzed conversion of CBD. Mildly intoxicating, often described as roughly half to two-thirds the potency of delta-9. Sold in vape carts, gummies, tinctures, flower (sprayed/infused), and pre-rolls. Delta-8 was the original loophole product after 2018 and remains the most common.

Delta-10 THC

Another isomer of THC, also produced by chemical conversion. Generally reported as less potent than delta-8. Sold in similar product formats; sometimes blended with delta-8 or other cannabinoids in “blend” vapes.

THC-O Acetate

Delta-8 or delta-9 THC reacted with acetic anhydride to produce the acetate ester. Reported by industry sources as more potent than natural delta-9, with a delayed onset. THC-O is a synthetic cannabinoid in the chemical sense; in 2023 the federal DEA stated in informal correspondence that THC-O was not protected by the 2018 Farm Bill. The Anderson v. Diamondback ruling discussed below complicates that DEA position.

HHC and HHC-O

Hexahydrocannabinol (HHC) is a hydrogenated cannabinoid — THC reduced by hydrogen addition, producing a more chemically stable molecule. HHC-O is its acetate ester. Both are sold in vapes, gummies, and infused flower. Limited published pharmacology.

THCP

Tetrahydrocannabiphorol, a cannabinoid first identified in 2019, with a longer alkyl side chain than THC. Reported by industry sources as substantially more potent than delta-9. Often used in micro-doses or as a potency booster blended into other cannabinoid products.

THCA Flower

Tetrahydrocannabinolic acid (THCA) is the non-intoxicating acidic precursor to delta-9 THC. When raw cannabis flower is heated — smoked, vaped, or cooked — THCA decarboxylates into delta-9 THC. Because the federal definition tests the raw plant for delta-9 THC by dry weight, raw flower that is high in THCA but low in delta-9 (often near the 0.3% line) qualifies as hemp on paper. The same flower delivers a full marijuana-like experience when combusted.

THCA flower has become the dominant smokable hemp product on NC shelves and is the single largest contributor to the gap between “legal hemp” on a certificate of analysis and “effectively marijuana” in consumer use.

Hemp-Derived Delta-9 Edibles & Beverages

Because the 0.3% threshold is a percentage by dry weight, a sufficiently heavy or large-volume product can contain a substantial absolute amount of actual delta-9 THC and still test below 0.3%. A 100-gram chocolate bar can hold up to about 300 mg of delta-9 THC and remain compliant on a percentage basis; a 12-oz beverage can carry 5–10 mg or more without breaching the dry-weight test. Hemp-derived delta-9 gummies typically dose at 10–100 mg per package, putting them in the same active-THC range as adult-use cannabis products in legal states.

Quick Reference Table

The Legal Backbone: Anderson v. Diamondback

In Anderson v. Diamondback Investment Group, LLC, 2024 WL 4031401 (4th Cir. Sept. 4, 2024), the U.S. Court of Appeals for the Fourth Circuit held that the 2018 Farm Bill’s hemp definition is unambiguous and protects synthetically converted cannabinoids derived from hemp, so long as the finished product satisfies the delta-9 THC dry-weight ceiling. The Fourth Circuit covers North Carolina, so the ruling is binding precedent in NC.

Anderson is the doctrinal anchor that has kept NC’s hemp Wild West open while neighboring states (Tennessee, Georgia, and South Carolina to varying degrees) have moved to restrict similar products under state law. The ruling does not address the November 12, 2026 federal redefinition under P.L. 119-37, which changes the underlying statute the court was interpreting.

What the Loophole Does Not Cover

• Marijuana — raw cannabis flower above 0.3% delta-9 THC by dry weight is still Schedule VI under N.C.G.S. § 90-94.
• Synthetic THC outside the hemp pathway — isolated synthetic THC resin remains a Class I felony to possess under § 90-95.
• Federally controlled analogues — products that fall outside the Farm Bill definition (because they are not derived from hemp, or because they breach the 0.3% threshold in finished form) revert to controlled-substance status.

Explore the Hemp Wild West

Official Sources

• N.C.G.S. § 90-87 (definitions, including hemp)
• Agriculture Improvement Act of 2018 (full text)
• USDA Domestic Hemp Production Program