PDFWAC 314-11-080
Can liquor be substituted?
Liquor licensees or employees may not:
(a) Tamper, dilute, or fortify any bottle of spirituous liquor;
(b) Sell or serve any spirituous liquor, beer, or wine other than ordered; or
(c) Substitute a nonalcoholic beverage when an alcoholic beverage has been ordered (see WAC 314-11-035 regarding a licensee's responsibility to not serve liquor to an apparently intoxicated person).