As shoppers stock their liquor cabinets for the holidays, a new lawsuit alleges that some of Costco’s Kirkland-brand tequilas aren’t as premium as their labels might suggest.

Some Kirkland tequila brands that claim to contain only alcohol distilled from the blue agave plant actually include other, lesser-quality alcohols, according to a suit filed Friday on behalf of 13 aggrieved tequila drinkers in Washington and eight other states.

Tests found that some of the Kirkland-brand tequilas were so adulterated they didn’t even qualify as tequila under Mexican law, according to the suit, which was filed in federal court in Seattle.

The case, which follows similar litigation in other states, drags Costco into a high-spirited, if little known, controversy involving claims of deceptive marketing

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