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A number of airports, including Heathrow, have been ordered to intensify screening of electronic devices.
American transport officials said in a statement that passengers could be asked to switch on devices, and equipment that does not power up would not be allowed on board.New Airport Security Checks Require Your Electronic Device To Turn On [bbc.co.uk]
I assume the US stopped doing it because it is annoying, unreasonable and pointless.
Surely, any object we take on board could be a threat,