Wash. Rev. Code § 9.91.060
Every person having the care and custody, whether temporary or permanent, of minor children under the age of twelve years, who shall leave such children in a parked automobile unattended by an adult while such person enters a tavern or other premises where vinous, spirituous, or malt liquors are dispensed for consumption on the premises shall be guilty of a gross misdemeanor.
[ 1999 c 143 s 9; 1951 c 270 s 17.]
Leaving children unattended in standing vehicle with motor running: RCW 46.61.685.