In a recent ruling, a federal judge in Arizona has granted a temporary restraining order, blocking the state from pursuing criminal charges against prediction market provider Kalshi. This decision comes in response to a motion filed by the Commodity Futures Trading Commission, which argued that Arizona's actions were preempted by federal law.

The ruling, issued by District Judge Michael Liburdi, prevents Arizona from proceeding with an arraignment of Kalshi that was scheduled to take place. The state had announced plans to file 20 criminal charges against Kalshi, alleging that the company's offerings violated Arizona law. However, the court found that the Commodity Futures Trading Commission had made a strong case that it would succeed in its claim that Arizona's laws are preempted by the Commodity Exchange Act. The judge noted that allowing Arizona to proceed with its action could violate the Supremacy Clause, and granted the temporary restraining order for a period of two weeks.

The Commodity Futures Trading Commission has welcomed the decision, with Chair Michael Selig stating that the regulator appreciates the judge's ruling. Selig emphasized that Arizona's use of state criminal law against companies that comply with federal law sets 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 case is part of a broader dispute between the Commodity Futures Trading Commission and several states, including Arizona, over the regulation of prediction markets. The Commodity Futures Trading Commission argues that these markets are subject to its supervision, while the states claim that they have the authority to regulate them under their own laws. The issue has seen mixed results in court, with some state courts siding with the states and federal courts reaching different conclusions.

The Third Circuit Court of Appeals recently ruled that prediction markets are subject to the Commodity Futures Trading Commission's rule, while the Ninth Circuit Court of Appeals declined to weigh in on a similar case in Nevada. The latest development in the case is the federal judge's decision to grant the Commodity Futures Trading Commission's motion to block Arizona's action against Kalshi, which was made two days after the judge denied Kalshi's own motion for a preliminary injunction against the state.