北師大版高中英語(yǔ)模塊11--Unit33(3)-2

[00:01.42]2 Modern lie detectors [00:04.66]Modern lie detectors- [00:05.98]also known as "polygraphs"- [00:07.67]rely on the same basic principle- [00:09.88]that lying causes bodily changes, [00:12.57]which can be detected and measured. [00:14.72]Having agreed to do the test [00:16.75](if the test is done under duress, [00:18.68]the extra stress caused [00:20.43]makes the test unreliable), [00:22.52]the suspect is connected to three devices [00:24.96]measuring blood pressure, [00:26.70]breathing rate and eletrodermal response [00:30.27](the increased amount of electricity [00:31.85]which flows to the skin when we sweat). [00:34.75]Increased activity in these areas [00:37.48]suggests increased stress... [00:39.90]which means the subject might be lying. [00:42.83]Lie detectors have been widely used [00:45.04]in the US since the 1950s [00:47.31]but they remain controversial [00:49.16]and their results are not [00:50.56]always accepted by courts. [00:53.11]The results of a test taken by the British [00:55.76]nanny Louise Woodward to support her plea [00:58.59]of not guilty to killing a child [01:00.94]in her care were not admitted as evidence [01:04.12]at her trial in Massachusetts. [01:06.62]Nowadays, polygraphs are used by the US police, [01:10.05]the CIA and the FBI to screen job applicants, [01:14.09]but private employers are not allowed [01:16.26]to subject job candidates [01:18.20]to polygraph examinations,except in a few high [01:21.75]-security industries like pharmaceuticals [01:24.42]and money manufacturing. [01:24.94]

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