Wash. Rev. Code § 69.50.438
In addition to any other civil or criminal penalty, every person who violates or causes another to violate RCW 69.50.401 by distributing, dispensing, manufacturing, displaying for sale, offering for sale, attempting to sell, or selling to a purchaser any product that contains any amount of any cathinone or methcathinone, as identified in RCW 69.50.204, must be fined not less than ten thousand dollars and not more than five hundred thousand dollars. If, however, the person who violates or causes another to violate RCW 69.50.401 by distributing, dispensing, manufacturing, displaying for sale, offering for sale, attempting to sell, or selling any product that contains any amount of any cathinone or methcathinone, as identified in RCW 69.50.204, to a purchaser under the age of eighteen, the minimum penalty is twenty-five thousand dollars if the person is at least two years older than the minor. Unless the court finds the person to be indigent, this additional fine may not be suspended or deferred by the court.
RCW 69.50.438
Findings-Intent-Effective dates-2015 2nd sp.s. c 4: See notes following RCW 69.50.334.