Costco Tequila Buyers Say Agave Certification Isn't Conclusive

By Rachel Riley ( September 15, 2026, 8:51 PM EDT) -- Tequila buyers who claim Costco falsely labeled Kirkland Signature-brand tequila told a Washington federal judge on Tuesday that a Mexico-based council's certification of the bottles as "100% agave" isn't enough to extinguish their deceptive marketing case against the U.S. retailer....

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