US Army soldiers in Afghanistan will be given portable detectors to help determine whether suspects in roadside bombings or people looking to enter military bases are telling the truth, writes Associated Press.

So far, the army has bought 94 of the US$7,500 Preliminary Credibility Assessment Screening System portable detectors, says special assistant to the director at the Defense Academy for Credibility Assessment Donald Krapohl.

Krapohl adds that the devices are not exactly the same as polygraphs or lie detectors but work by connecting sensors placed on an interviewee’s hand that measure stress and heart rate to a pocket-sized computer.

The computer then shows a green light when someone is telling the truth, red if not and yellow if results are inconclusive.

A field test at Fort Jackson produced an 80 percent success rate, after setting aside inconclusive results, while a second, independent test returned correct results 92 percent of the time, according to Krapohl.

The Preliminary Credibility Assessment Screening Systems will be among several tests the army uses to decide if a person is truthful.

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