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Additionally, “tamper-evident security seals in a double-lock location” would protect machines and votes.

They are stored under double-lock at hospitals and governed by so-called “red prescriptions,” which only specially certified doctors can write.

As MIT President L. Rafael Reif has written, “If all we do in response to China’s ambition is to try to double-lock all our doors, I believe we will lock ourselves into mediocrity.”

The US car giant recommended people double-lock their cars, and store their keys in a "suitable metal box" that will block radio signals.

Husted says the machines are kept “under double-lock and key.”