Sensor proponents, however, argue that smartphones and corporate ID badges already can transmit their owner's location.

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Intel announced this Processor ID in January as a tool for corporate asset management and e-commerce, but privacy advocates cried foul.

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In the corporate sector hundreds of employers already use omnipresent cameras, motion sensors and smart ID cards--an infrastructure that could be easily converted to serve antiterrorist purposes.

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Each caller is assigned a unique ID which can be used to receive a reward from Western Union, should the corporate client determine that the information has value.

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