A user on Quizlet, an online learning platform, created a public flashcard set in February that appears to have exposed highly confidential information about security procedures in US Customs and Border Protection facilities around Kingsville, Texas.
The Quizlet set, titled “USBP Review,” was available to the public until March 20, when it was made private less than half an hour after WIRED messaged a phone number potentially linked to the Quizlet user. Though an individual with the user’s name was…

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