Wash. Rev. Code § 82.08.0317
(1)
(a) State sales tax is not imposed on the sale of a motor vehicle:
(b) In order to substantiate the tax exempt status of a tribal member, the seller must require presentation of one of the following:
(c)
(5) The definitions in this subsection apply throughout this section unless the context clearly requires otherwise.
[ 2016 c 232 s 1.]