Ohio Judge Blocks Hemp THC Cap on Dormant Commerce Clause Grounds

Court Finds Likely Commerce Clause Violation

U.S. District Judge Edmund Sargus ruled that Ohio's total-THC cap creates an unconstitutional barrier to interstate commerce by effectively banning hemp products legal under federal law and in other states. The preliminary injunction applies statewide. It prevents Ohio from enforcing the 0.3% total-THC standard enacted in House Bill 210, which took effect June 1, 2026.

The ruling centers on the dormant Commerce Clause, a constitutional doctrine prohibiting states from enacting laws that discriminate against or unduly burden interstate trade. Judge Sargus found that Ohio's definition of "total THC"—which includes delta-9 THC plus the theoretical maximum delta-9 that could result from decarboxylation of THCA—operates as a de facto ban on hemp flower and concentrates produced in states that follow the federal 0.3% delta-9 standard.

The state couldn't demonstrate a legitimate local purpose achievable through less discriminatory means, according to the court. Ohio argued the cap was necessary to prevent intoxication, but the judge noted that the 2018 Farm Bill already establishes a national hemp standard measured by delta-9 THC alone.

Total-THC vs. Delta-9: The Chemistry at Issue

The case turns on how THC is measured—a fight that has divided state regulators nationwide. Federal law defines hemp as cannabis containing no more than 0.3% delta-9 THC on a dry-weight basis. Delta-9 is the primary intoxicating cannabinoid.

THCA, or tetrahydrocannabinolic acid, is the non-intoxicating precursor found in raw cannabis flower. When heated (smoked, vaped, or cooked), THCA converts to delta-9 through decarboxylation at a roughly 87.7% conversion rate. Ohio's law treated THCA as if it were already delta-9, applying a 0.877 multiplier to calculate "total THC."

Under that formula, a hemp flower testing at 0.2% delta-9 and 15% THCA would register as 13.4% total THC—flagging it as marijuana under Ohio law even though it qualifies as hemp under the Farm Bill.

Hemp processors in states like Oregon, Colorado, and North Carolina—where THCA flower is legally grown and sold as hemp—argued Ohio's standard effectively closed the state to their products. The court agreed. The discrepancy created an impermissible trade barrier.

Plaintiff Coalition and Legal Strategy

The lawsuit was brought by a coalition of out-of-state hemp processors, Ohio retailers, and a national trade group representing the THCA supply chain. Lead plaintiffs included:

• Sunset Lake CBD (Vermont processor shipping THCA flower nationwide)
• Ohio Hemp Collective (retail association with 40+ member stores)
• U.S. Hemp Roundtable (trade group representing 1,200+ hemp businesses)

Their complaint, filed in the U.S. District Court for the Southern District of Ohio on June 15, argued that Ohio's law violated both the dormant Commerce Clause and the Supremacy Clause by imposing a state standard that conflicts with federal hemp regulation. The preliminary injunction addresses only the Commerce Clause claim. The Supremacy Clause argument remains pending.

Attorneys for the plaintiffs cited a 2022 precedent from the Sixth Circuit Court of Appeals, which held that states may not impose testing or labeling requirements on hemp that are more restrictive than the USDA's unless they can show a compelling local interest. Ohio's attempt to redefine THC measurement failed that test, the plaintiffs argued.

Impact on Ohio's Hemp and Cannabis Markets

The injunction preserves access to THCA flower and concentrates in Ohio's $180 million hemp retail sector while the state's adult-use cannabis program remains stalled. Ohio voters approved recreational marijuana in November 2023, but the state hasn't issued a single adult-use license. Dispensaries are still medical-only.

That regulatory gap turned hemp retailers into the de facto adult-use channel. THCA flower—sold in gas stations, vape shops, and online—became Ohio's most popular intoxicating product by volume in 2025, according to data from the Ohio Hemp Association. The state's June crackdown threatened to shut down that market overnight.

Now, with the injunction in place, retailers can continue selling THCA products that comply with federal hemp standards. The Ohio Department of Commerce, which oversees hemp regulation, hasn't yet commented on whether it'll appeal the ruling or wait for a final judgment on the merits.

Broader Implications for State Hemp Regulation

The Ohio ruling is the first federal court decision to strike down a state total-THC cap on dormant Commerce Clause grounds, and it may embolden challenges in other states. At least 12 states have enacted or proposed total-THC limits since 2023, including:

• Minnesota (0.3% total THC, effective August 2025)
• Louisiana (0.3% total THC, effective January 2026)
• Texas (proposed 0.5% total THC cap, pending in legislature)
• Florida (emergency rule capping total THC at 0.3%, challenged in state court)

Legal experts note that the dormant Commerce Clause is a powerful tool for hemp businesses, but it applies only when a state law discriminates against interstate trade. States that apply their total-THC caps equally to in-state and out-of-state hemp may face weaker challenges, though the Supremacy Clause argument—that federal law preempts conflicting state standards—remains available.

For full background on this story and ongoing litigation, see the CannIntel topic hub on Ohio hemp regulation.

What Happens Next

The preliminary injunction remains in effect until the court issues a final ruling on the merits or the case is resolved through settlement or appeal. Judge Sargus set a case-management conference for August 5 to establish a briefing schedule for summary judgment motions.

Ohio's attorney general has 30 days to file a notice of appeal to the Sixth Circuit, though the state may choose to litigate the case at the district level first. If Ohio appeals and loses, the ruling would set binding precedent across the Sixth Circuit, which also covers Michigan, Kentucky, and Tennessee—three states where similar total-THC bills have been introduced.

Hemp retailers in Ohio are restocking THCA flower and concentrates. Enforcement will vary. Local prosecutors may still pursue charges under state marijuana laws, and the Ohio State Highway Patrol hasn't issued guidance on how troopers should handle THCA products during traffic stops. This is unsettled.