RCW 66.44.300: Treats, gifts, purchases of liquor for or from minor, or holding out minor as at least twenty-one, in public place where liquor sold.

Any person who invites a minor into a public place where liquor is sold and treats, gives or purchases liquor for such minor, or permits a minor to treat, give or purchase liquor for the adult; or holds out such minor to be twenty-one years of age or older to the owner or employee of the liquor establishment, a law enforcement officer, or a liquor enforcement officer shall be guilty of a misdemeanor.