Why You’ll Never Be Able to Block a Presidential Alert(atlasobscura.com)
atlasobscura.com
Why You’ll Never Be Able to Block a Presidential Alert
http://www.atlasobscura.com/articles/why-youll-never-be-able-to-block-a-presidential-alert
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"Such a presidential alert has never been sent, but since 2006, they've been unblockable by law"