Though the personal preference of the security officer might be that virtual systems are not used, that security officer must recognize that there will always be risk associated with meeting the business objectives.

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"There must be a more robust military and security component to U.S. policy, " he said.

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There is a great and good nation whose freedom and security must be defended.

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Shadow Home Secretary Yvette Cooper said the police and security services had to be able to keep up with new technology, but there must be "clear checks and balances" on what they were able to do and "strong safeguards to protect people's privacy".

BBC: UK Politics