0.3 percent THC limit

The 0.3 percent THC limit is the federal threshold, measured as delta-9 THC by dry weight, that separates lawful hemp from marijuana under the Controlled Substances Act.

The figure comes from the 2018 Farm Bill's definition of hemp and applies to the plant and its derivatives. Federal production rules measure compliance as total THC, which includes THCA converted by a factor of 0.877, and crops that exceed the limit must be disposed of. The number was drawn from earlier scientific classification work rather than from any assessment of effect.

For a reader, the limit is a threshold on the plant and the extract, not a promise about a finished product. A full-spectrum product made from compliant hemp can still contain measurable THC up to that concentration, and a small amount per serving can add up with regular use. Products aiming for 0.0% THC go well below the limit through isolation or remediation, and the certificate of analysis for the batch is what shows where a product actually sits.