NEW SECTION. Sec. 13. There may be licensed, in no greater number in each of the counties of the state than as the state liquor control board shall deem advisable, retail outlets established for the purpose of making useable marijuana and marijuana-infused products available for sale to adults aged twenty-one and over. Retail sale of useable marijuana and marijuana-infused products in accordance with the provisions of this act and the rules adopted to implement and enforce it, by a validly licensed marijuana retailer or retail outlet employee, shall not be a criminal or civil offense under Washington state law.