The Government is intending to roll out mandatory polygraph tests for high risk sex offenders across England and Wales.It was made in the East and West Midlands from April 2009 to October 2011.About 600 sex offenders who were freed on licence were tested from six to six months in order to understand if they had breached the terms of their release.The pilot identified that offenders were two to three times more likely to admit to potential breaches of their licence, often before they had even undergone the test procedure.The scientists think the pilot stop numerous new offences from being committed. Polygraph tests measure blood pressure, heart rate, breathing and levels of perspiration, which are vital signs that can display subtle changes when someone is deliberately evasive and polygraph experts can better conclude if that person is lying. Studies have shown that polygraph tests are accurate almost 85% of the time.
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