TLDR
- A federal judge issued a preliminary injunction stopping Arizona from applying its gambling laws to prediction markets
- The ruling came after Arizona filed criminal charges against Kalshi, a CFTC-regulated prediction market platform
- The court found that federal law preempts state authority over event contracts traded on registered markets
- The decision is part of a broader legal fight, with the CFTC suing multiple states to defend its jurisdiction
- Courts in other states have split on the issue, with appeals expected to continue
The legal battle between state gambling regulators and the federal government over prediction markets just hit another turning point. A federal judge in Arizona has blocked the state from enforcing its gambling laws against platforms regulated by the Commodity Futures Trading Commission.
On May 5, 2026, the District Court for Arizona issued a preliminary injunction. The order bars Arizona from pursuing criminal or civil actions against event contracts traded on CFTC-regulated designated contract markets.
The case began when Arizona’s Department of Gaming sent a cease-and-desist letter to KalshiEX LLC. The state warned the prediction market platform to stop operating without a state license.
Shortly after, Arizona’s attorney general filed criminal charges against Kalshi. It was the first criminal prosecution of its kind against a prediction market platform in the United States.
Kalshi fought back by filing a lawsuit. The company argued that the Commodity Exchange Act gives the CFTC sole jurisdiction over contracts traded on registered markets.
The CFTC and the Department of Justice then filed their own case against Arizona. They claimed state enforcement was preempted by federal law.
Court Finds Federal Law Overrides State Gambling Rules
The judge sided with the federal regulators. The court said Congress gave the CFTC exclusive authority over swaps and event contracts.
The ruling rejected Arizona’s argument that only the sporting event itself counts when classifying these contracts. The court found that event contracts qualify as swaps under the Commodity Exchange Act.
The judge described the case as “a clash between two competing authorities.” On one side was the state’s police power over gambling. On the other was Congress’s regulation of derivatives.
Three separate grounds for preemption were cited. Field preemption was established because the CFTC has exclusive jurisdiction. Conflict preemption applied because state enforcement would obstruct Congress’s goals. Impossibility preemption was found because CFTC rules require open market access while Arizona law criminalizes wagering without a state license.
The court warned that allowing states to prosecute operators would create the “inconsistent regulatory patchwork that Congress intended to avoid.”
Federal Push Extends Beyond Arizona
The Arizona ruling is part of a wider legal fight playing out across multiple states. Courts have split on similar cases involving prediction market regulation.
The Third Circuit has already sided with Kalshi in a New Jersey case. The Ninth Circuit is expected to rule soon in a separate challenge.
CFTC Chairman Selig has filed lawsuits against several states, including Connecticut, Illinois, New York, and Wisconsin. The agency is working to defend its authority over prediction markets nationwide.
Selig has warned that pushing prediction markets offshore could expose U.S. information streams to manipulation by foreign adversaries.
With appeals likely in the Arizona case, the decision adds momentum to the federal government’s effort to establish control over prediction markets across the country. The outcome of these cases could shape how prediction markets operate in the United States for years to come.
