In a recent ruling, a federal judge has temporarily blocked Arizona's attempt to bring criminal charges against Kalshi, a prediction market provider. This decision comes in response to a motion filed by the Commodity Futures Trading Commission. District Judge Michael Liburdi of the District of Arizona ruled that Arizona cannot proceed with an arraignment of Kalshi as previously scheduled. The state had announced plans to file 20 criminal charges against Kalshi, alleging that the company's offerings violated Arizona law.

The judge's ruling stated that the Commodity Futures Trading Commission has demonstrated a likelihood of succeeding in its claim that Arizona's gambling laws are preempted by the Commodity Exchange Act. Proceeding with the state action could potentially violate the Supremacy Clause, leading the judge to grant a temporary restraining order for a period of two weeks. A pending motion for a preliminary injunction may extend this order.

The temporary restraining order explicitly prohibits Arizona from enforcing its gambling laws in any criminal or civil enforcement actions related to contracts listed on CFTC-regulated markets. The CFTC Chairman, Michael Selig, expressed appreciation for the judge's decision, stating that Arizona's use of state criminal law against companies complying with federal law sets a dangerous precedent. The CFTC has argued that prediction markets, also known as event contracts, are subject to federal supervision as swaps.

This stance has yielded mixed results in court, with state courts often siding with states and federal courts producing varying outcomes. The case is part of a broader debate about the regulation of prediction markets, with implications for companies like Kalshi and the authority of federal versus state law.