In a recent ruling, a federal judge in Arizona has temporarily blocked the state from filing criminal charges against Kalshi, a prediction market provider. The decision comes in response to a motion filed by the Commodity Futures Trading Commission. District Judge Michael Liburdi stated that Arizona cannot proceed with an arraignment of Kalshi as previously scheduled, after the state announced plans to file 20 criminal charges against the company for allegedly violating Arizona law by offering betting products.

The judge's ruling noted that the Commodity Futures Trading Commission has demonstrated a likelihood of succeeding in its claim that Arizona's gambling laws are preempted by federal law. As a result, Arizona's pursuit of a state action may violate the Supremacy Clause, leading the judge to grant a temporary restraining order for a period of two weeks. The order also mentions a pending motion for a preliminary injunction, which, if granted, would extend the temporary restraining order.

The judge's decision was welcomed by CFTC Chair Michael Selig, who stated that Arizona's attempt to use state criminal law against companies complying with federal law sets a dangerous precedent. The case is part of a broader dispute between the CFTC and several states regarding the regulation of prediction markets, also known as event contracts. While state courts have often sided with the states, federal courts have yielded mixed results, with some ruling in favor of the CFTC's supervision and others declining to intervene.