By Morgan Davis, Health and Wellness Attorney
Hemp 101: Understanding Total THC vs. Delta-9 THC
If you’re in the hemp industry, you’ve likely heard about total THC vs delta-9 THC—but do you know what they really mean? This topic causes confusion across the board, from farmers and retailers to law enforcement and regulators. So, let’s break it down clearly.
What Is the Total THC Standard?
Total THC is used during cultivation to determine if a hemp crop is compliant before harvest. This value combines:
- Delta-9 THC
- THCA × 0.877 (a conversion factor for decarboxylation)
This formula predicts how the plant will degrade after harvest. The USDA’s rule is clear: if your crop tests above 0.3% total THC within 30 days of harvest, it’s non-compliant and considered marijuana under federal law.
What About Delta-9 THC?
Delta-9 THC, on its own, is the federal legal standard for hemp products after harvest. Under the 2018 Farm Bill, any product must contain less than 0.3% delta-9 THC on a dry weight basis to be considered hemp, not marijuana. Many states follow this standard too.
Two Standards, One Industry
Why do both standards exist? Because hemp evolves. Like bananas ripening after harvest, hemp continues to change. THCA becomes delta-9 THC, which eventually degrades to CBN. USDA regulators wisely chose the total THC model for cultivation to give farmers a fair chance to produce legal hemp once it enters commerce.
But once the product is processed, transported, or sold—it’s the delta-9 standard that applies.
Common Misconceptions Debunked
Misconception 1: Total THC = all THC isomers.
❌ False. Total THC refers only to delta-9 and THCA (times 0.877), not every THC variant.
Misconception 2: A compliant pre-harvest COA makes your product permanently legal.
❌ False. If your product exceeds 0.3% delta-9 post-processing, it’s illegal under federal law—even if it passed pre-harvest testing.
Misconception 3: Total THC is the universal federal standard.
❌ False. It’s the standard for licensed cultivators only. After harvest, delta-9 governs commerce—unless your state sets a stricter rule.
Interstate Commerce Considerations
States may impose stricter limits than federal law—but they can’t interfere with legal interstate shipments. If your product passes through a stricter state without stopping to sell, courts often protect it under the Commerce Clause. But stopping to do business? That invites local jurisdiction.
Still Have Questions About Hemp Compliance?
You’re not alone—this topic is complex and constantly evolving. If you’re unsure whether your product meets the right standard, reach out. At Davis Legal, we help hemp businesses stay compliant, protected, and thriving. Contact us today.
