Seattle-based law firm Hagens Berman filed a nationwide class action lawsuit against Costco alleging its Kirkland Signature Tequila is adulterated and falsely labeled as “100% de Agave.”

The RICO complaint, filed in Washington federal court on behalf of 13 plaintiffs, claims that laboratory testing using carbon isotope ratio analysis showed Kirkland Blanco tequila contains only 60% to 80% agave ethanol while Kirkland Reposado ranges from 5% to 25%.

What they’re saying: “We believe Costco’s marketing of its tequila products is two-faced, and that despite marketing it as a premium – and reflecting that in its price – consumers have been misled about the quality of Kirkland Signature,” said Steve Berman, managing partner of Hagens Berman, in a statement. “Consumers who purchased Kirkland te

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