A US federal judge has refused to unseal court paperwork that would show how the FBI tried to force Facebook to snoop on calls made through its instant-messaging app. Judge Lawrence O’Neill this week rejected [PDF] a petition from the American Civil Liberties Union (ACLU) to make the documents public because, he argued, “the materials at issue in this case concern techniques that, if disclosed publicly, would compromise law enforcement efforts in many, if not all, future wiretap investigations.”

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