Missouri Hemp Industry Files Federal Lawsuit Challenging THC Product Ban

Federal Preemption Claim Centers on Farm Bill Authority

The lawsuit argues Missouri's ban directly conflicts with the 2018 Farm Bill's definition of legal hemp as cannabis containing no more than 0.3% delta-9 THC by dry weight. Plaintiffs contend the emergency rule, issued by the Missouri Department of Health and Senior Services (DHSS), improperly restricts products that meet the federal THC threshold, creating a regulatory scheme that conflicts with Congress's intent to legalize hemp commerce nationwide.

Section 297A of the Agricultural Improvement Act of 2018 removed hemp from the Controlled Substances Act. It granted states the authority to regulate hemp production but not to prohibit products that comply with federal standards. Missouri's rule bans all products marketed or labeled as intoxicating, regardless of THC concentration, according to the filing.

Attorneys for the plaintiffs argue this approach exceeds the state's regulatory authority. The federal statute preempts state laws that are more restrictive than the Farm Bill's THC limit, the complaint asserts.

Emergency Rule Process Allegedly Violated State Administrative Law

The lawsuit challenges the procedural basis for the emergency rule, alleging DHSS failed to demonstrate the imminent peril required under Missouri's Administrative Procedure Act. State law permits emergency rulemaking only when an agency finds that imminent peril to public health, safety, or welfare requires immediate action.

DHSS provided no evidentiary support for such a finding, the complaint argues. Hemp-derived THC products have been sold in Missouri since the Farm Bill's passage in 2018 without documented emergency-level public health incidents, according to the filing. The rule's preamble cited general concerns about youth access and product safety but included no data linking these concerns to imminent harm.

Missouri's emergency rule statute also requires agencies to begin the standard rulemaking process within 180 days of issuing an emergency rule. Plaintiffs seek a declaration that DHSS must comply with this requirement or allow the emergency rule to expire.

Injunction Request Targets Immediate Enforcement Halt

Plaintiffs are seeking a temporary restraining order and preliminary injunction to block enforcement of the ban while the case proceeds. Hemp retailers and manufacturers face irreparable harm from the rule, including business closures, inventory losses, and contract breaches with suppliers, the motion argues.

One plaintiff, a Missouri-based hemp product distributor, reported $2.3 million in unsellable inventory as of July 15, according to an affidavit attached to the complaint. A retail chain operating 14 locations in Missouri stated it laid off 47 employees within two weeks of the ban's effective date. That's nearly half its workforce.

The economic harm is immediate and irreversible, and no adequate remedy at law exists to compensate businesses forced to shutter operations or destroy compliant products due to an unlawful state rule.

The court hasn't yet scheduled a hearing on the injunction motion.

Named Plaintiffs Include National and State Trade Groups

The lawsuit was filed by the U.S. Hemp Roundtable, the Hemp Industries Association, and the Missouri Hemp Trade Association, representing manufacturers, processors, and retailers across the state. Three individual Missouri-based businesses are also named as plaintiffs: a hemp cultivator in Boone County, a product manufacturer in Jackson County, and a retail chain with locations in St. Louis, Kansas City, and Springfield.

Vicente LLP, a Denver-based cannabis and hemp law firm, is providing legal representation alongside Thompson Coburn LLP, a Missouri firm with offices in St. Louis. Both firms have previously litigated hemp regulatory disputes in other states.

Robert Knodell, director of the Missouri Department of Health and Senior Services, is the defendant, sued in his official capacity. The Missouri Attorney General's office, which will represent DHSS in the litigation, declined to comment on pending litigation.

Missouri's Rule Bans Products Marketed as Intoxicating

The emergency rule prohibits the manufacture, distribution, and sale of any hemp product marketed, labeled, or intended to induce intoxication, regardless of THC content. This includes products containing delta-8 THC, delta-10 THC, THC-O, and THCP, even when derived from hemp and compliant with the 0.3% delta-9 THC limit.

Products with added THC, whether synthetic or naturally derived, are also banned. All hemp-derived consumable products must be tested by a state-licensed laboratory. Retailers found in violation face civil penalties up to $10,000 per violation and potential license revocation.

DHSS issued the rule on June 17, 2026, with a 14-day effective period. The agency stated the rule was necessary to address a surge in emergency room visits and poison control calls related to hemp-derived THC products, particularly among minors. But the rule's preamble didn't cite specific incident data or compare rates to other consumer products, the lawsuit notes.

Case Joins Growing Wave of Hemp Litigation Nationwide

Missouri's lawsuit is the latest in a series of federal court challenges to state bans on intoxicating hemp products enacted since 2024. Similar litigation is pending in North Carolina, Texas, and Minnesota, with mixed results. A federal judge in North Carolina granted a preliminary injunction blocking that state's ban in March 2026, finding plaintiffs were likely to succeed on their preemption claim. A Texas court denied a similar motion in May 2026, ruling the state's police powers allowed it to regulate intoxicating substances even if federally compliant.

How the court interprets the Farm Bill's preemption scope will likely determine the Missouri case's outcome. So will whether the state's emergency procedure met statutory requirements. For context on the broader regulatory conflict, see the CannIntel topic hub on Missouri's hemp THC ban.

A hearing on the injunction motion is expected within 30 days. If the court denies the injunction, the case will proceed to discovery and trial on the merits, a process that could take 12 to 18 months. If granted, the ban will remain blocked pending final resolution.