Wash. Rev. Code § 46.48.185
The chief of the Washington state patrol shall direct the necessary qualified personnel to inspect the cargo of any motor carriers vehicle transporting hazardous material, inspect for proper securing, and inspect for the combined loading of cargo which would be inconsistent with the provisions of Title 49 C.F.R., parts 100 through 199. Authorized personnel inspecting loads of hazardous material shall do so in the presence of a representative of the motor carrier. Seal and locking devices may be removed as necessary to facilitate the inspection. The seals or locking devices removed shall be replaced by the Washington state patrol with a written form approved by the chief to certify seal or locking device removal for inspection of the cargo.
RCW 46.48.185