Unlawful stops, searches, and seizures under the Fourth Amendment.
Washington courts apply both the U.S. Constitution and the Washington Constitution to fourth amendment search & seizure claims. When state protections are broader than federal ones, Washington judges follow the state rule. When they are equal or narrower, federal precedent controls under the Supremacy Clause.
Federal cases governing fourth amendment search & seizure include controlling U.S. Supreme Court decisions and binding precedent from the federal circuit covering Washington. Civil remedies most often proceed under 42 U.S.C. § 1983, with defenses including qualified immunity.
Legal information, not legal advice. For advice on your situation, consult a licensed attorney in Washington.