In a recent ruling, a federal judge in Arizona has granted a temporary restraining order, preventing the state from bringing criminal charges against Kalshi, a prediction market provider. This decision comes in response to a motion filed by the Commodity Futures Trading Commission.

The ruling, issued by District Judge Michael Liburdi, prohibits Arizona from proceeding with an arraignment of Kalshi that was scheduled for Monday, April 13. Arizona had announced plans to file 20 criminal charges against Kalshi, alleging that the company's offerings violated state law.

However, the judge found that the CFTC is likely to succeed in its claim that Arizona's gambling laws are preempted by the Commodity Exchange Act. The temporary restraining order will remain in place for two weeks, and a pending motion for a preliminary injunction could potentially extend this period. The CFTC has welcomed the judge's decision, with Chair Michael Selig stating that Arizona's actions set a dangerous precedent and that the court's order sends a clear message that intimidation is not an acceptable tactic to circumvent federal law.

The CFTC's lawsuit against Arizona and two other states argues that prediction markets are subject to federal supervision and that state law is preempted. The ruling is the latest development in a complex and ongoing dispute between federal and state authorities over the regulation of prediction markets.