Wash. Rev. Code § 81.04.530
A person or employer operating as a motor carrier shall comply with the requirements of the United States department of transportation federal motor carrier safety regulations as contained in Title 49 C.F.R. Part 382, controlled substances and alcohol use and testing. A person or employer who begins or conducts commercial motor vehicle operations without having a controlled substance and alcohol testing program that is in compliance with the requirements of Title 49 C.F.R. Part 382 is subject to a penalty, under the process set forth in RCW 81.04.405, of up to one thousand five hundred dollars and up to an additional five hundred dollars for each motor vehicle driver employed by the person or employer who is not in compliance with the motor vehicle driver testing requirements. A person or employer having actual knowledge that a driver has tested positive for controlled substances or alcohol who allows a positively tested person to continue to perform a safety-sensitive function is subject to a penalty, under the process set forth in RCW 81.04.405, of one thousand five hundred dollars.
RCW 81.04.530