Of course, some other stores — warehouse clubs and mainstream grocery stores — do this too. Additionally, Costco apparently has an internal food safety team that actually goes out and shadows auditors who inspect various vendors. “There may be other retailers that do this some, but Costco is tops in intensity of their program,” says one auditor on Twitter. They check on suppliers, give feedback, provide trainings, and make requests! Members can rest assured that whatever item you purchase at Costco is fully vetted.