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Washington AG Nick Brown filed a civil lawsuit against Kalshi on March 27, 2026, arguing its prediction-market platform constitutes illegal gambling under the Washington Gambling Act and Consumer Protection Act.

• Washington's gambling laws are among the most restrictive in the country — online betting has been prohibited since 2006, and sports wagers are only legal in person on tribal lands. The AG's suit applies those existing rules to Kalshi's platform, so there is no new prediction-market-specific law; the coverage comes from older statutes being enforced in a new context. Kalshi is contesting the lawsuit and argues that its status as a federally regulated CFTC exchange means state gambling laws cannot reach it. Courts in New Jersey and Tennessee have sided with that federal-preemption argument in similar cases, while courts in Massachusetts and Ohio have sided with state regulators. The Washington case is ongoing, and the outcome is not settled. For families in Washington, the practical posture as of May 2026 is that the state considers Kalshi's platform to constitute illegal gambling and is actively seeking a court order to shut it down here — but the platform has not been enjoined in Washington as of the sources reviewed.

• Check the King County Superior Court's public docket for the case filed March 27, 2026 against KalshiEX to see whether a temporary restraining order or injunction has been entered since the lawsuit was filed — that would change whether Kalshi can legally operate for Washington residents today. The AG's office complaint, linked from the press release at atg.wa.gov, also contains the full legal theory and the specific Kalshi markets at issue if you want the details.