More than two years after whistleblower Edward Snowden revealed how the National Security Agency collects phone call records en masse, that surveillance program is coming to an end. Starting Sunday, government agents must obtain a warrant on a so-called specific selection term from the Foreign Intelligence Surveillance Court, a secret federal court that oversees such requests. [...] that warrant must now identify “a person, account, address, or personal device in a way that limits the scope of information sought to the greatest extent reasonably practicable,” according to a blog run by the Office of the Director of National Intelligence.