KentuckyFC writes "If you live in the city of Bath in the UK and carry a Bluetooth-enabled device, your movements may have been secretly monitored in an experiment designed to test surveillance techniques in prisons. Researchers from Bath University recorded the movements of 10,000 Bluetooth-enabled devices during their 6-month trial. They say the experiment was a test of a technique for monitoring the interactions between prisoners in jail that could be used to work out which inmates have become closely associated. The work was prompted by revelations that the Madrid train bombers who devastated the city in 2004 first met in a Spanish prison (abstract)."
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