The U.S. Commodity Futures Trading Commission (CFTC) has filed an amicus brief with the Massachusetts Supreme Judicial Court, asserting its exclusive regulatory authority over derivatives markets, including event contracts. The CFTC emphasized that the Commodity Exchange Act preempts state laws, highlighting that some states have engaged in what it describes as "unlawful enforcement actions" against its regulated exchanges. The commission has already secured temporary restraining orders in states like Arizona to counter these actions.