The Ninth Circuit heard oral argument yesterday on whether it violates the First Amendment for the FBI to gag tech and telecommunications firms from revealing that they have received "national security letters" for customer records, Reuters reports. Tech companies, including Google, Microsoft Corp and Facebook Inc said in court papers "the government may not 'foist a gag order upon the involuntary recipient of an NSL, let alone prohibit the recipient from even reporting periodically the aggregate number of such demands that it receives,'" Reuters further reports.