It is an unfair or deceptive practice under RCW
19.86.020 for any person or entity to distribute, dispense, manufacture, display for sale, offer for sale, attempt to sell, or sell to a purchaser any product that contains any amount of any cathinone or methcathinone as identified in RCW
69.50.204(e) (3) and (5) [(5) (c) and (e)]. The legislature finds that practices covered by this section are matters vitally affecting the public interest for the purpose of applying the consumer protection act, chapter
19.86 RCW. Violations of this section are not reasonable in relation to the development and preservation of business.