DOJ and CFTC sue Arkansas to block state action against Kalshi

The Department of Justice and the Commodity Futures Trading Commission filed suit against Arkansas on Friday, seeking to block the state's enforcement action against Kalshi. The federal complaint argues that Arkansas lacks authority to regulate event contracts that fall under the Commodity Exchange Act, asserting that federal law preempts the state's gambling statute as applied to CFTC-regulated prediction markets.

Arkansas filed its own suit against Kalshi on November 4, alleging the platform operated an illegal gambling business within the state. The federal intervention escalates that dispute from a bilateral enforcement matter into a direct confrontation between state police power and federal preemptive jurisdiction.

The DOJ's entry is significant. CFTC enforcement actions against state regulators are rare; a Justice Department co-filing is rarer still. It suggests the federal government has concluded that passive defense of preemption arguments in individual state courts is no longer sufficient and that affirmative litigation is now the preferred instrument.

The legal standard at issue is whether the Commodity Exchange Act's preemption provision, as amended by Dodd-Frank, displaces state law that would otherwise prohibit activity the CFTC has affirmatively authorized. Courts applying that standard look to whether compliance with both federal and state law is a physical impossibility, or whether state law stands as an obstacle to the accomplishment of Congress's purposes under the CEA.