Simple Possession of Drugs Ruled Legal in Washington State Simple possession of any drug is now legal in the State of Washington. Yakima County Prosecutor Joe Brusic says the State Supreme Court ruled Thursday the state law that makes possession of drugs illegal is unconstitutional. The court today released the following information; "Simple Possession of Drugs. Washington’s strict liability drug possession statute, RCW 69.50.4013, makes possession of a controlled substance a felony exceeds the State’s police power and violates the due process clauses of the state and federal constituti...