In a significant development, a federal judge has intervened to stop Arizona from pressing criminal charges against Kalshi, a prediction market provider, at least for the time being. This move comes in response to a motion filed by the Commodity Futures Trading Commission. District Judge Michael Liburdi of the District of Arizona made the ruling, stating that Arizona cannot proceed with an arraignment of Kalshi as planned. The state had announced its intention to file 20 criminal charges against Kalshi for allegedly offering betting products that violate Arizona law.

The judge's decision is based on the likelihood that the Commodity Futures Trading Commission will succeed in its claim that Arizona's gambling laws are preempted by federal law. The ruling grants a temporary restraining order for two weeks, during which Arizona is barred from enforcing its gambling laws against Kalshi.

This decision has been welcomed by the CFTC, with its Chair, Michael Selig, stating that the regulator appreciates the judge's ruling and views Arizona's actions as an attempt to intimidate companies that comply with federal law. The CFTC has been arguing that prediction markets are subject to federal supervision and that state laws do not apply. The case highlights the ongoing debate over the jurisdiction of state versus federal law in regulating prediction markets, with mixed results in various courts.