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THE US National Security Agency may have to go back to asking permission before snooping on international calls.

A federal judge ruled last week that the agency’s programme of wiretapping telephone calls and online communications without a warrant, approved by President Bush in 2001, is unconstitutional. Judge Anna Diggs Taylor ruled that the practice violates the fourth amendment, the constitutional separation of powers, and a 1978 law requiring intelligence agencies to obtain a warrant from a secret court before wiretapping people in the US.

Taylor ordered the programme be shut down, although both sides in the case – the Department…

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