www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Society

Polygraphs can be key to solving a case

By Cao Yin | China Daily | Updated: 2017-09-11 08:44

Polygraphs can be key to solving a case

CUI YANPING, 38, is an expert in polygraphs, commonly called lie detectors. She has worked in Beijing Public Security Bureau's criminal investigation department since graduating from Capital Medical University in 2002.

I became hooked on my second day of work at the city's polygraph center.

A government department's safe had been emptied, and a preliminary investigation identified seven suspects working in its finance office. The building's security meant it was hard for nonemployees to enter.

Although the polygraph machines were similar with what I had used while studying clinical medicine at university, how the police collect and analyze data is very different.

As I was a novice, I watched a senior detective ask each employee a series of questions.

One man, who was wearing sunglasses, was connected to the device and asked, "Did you take the money?" He denied it, but our screens showed his physiological signals were fluctuating. When I saw that, my heart started beating fast. The man later confessed to stealing the money.

Since then, I've been addicted to this job. Such tests can provide an investigation with a direction, or even the key to cracking a case.

Polygraph tests are based on medical science and physiology, and have been widely adopted in Western countries, such as the United States and Japan. They have become more acceptable in China, too, in recent years.

Most of the time, our physiological reactions cannot lie when stimulated by a particular word, even when a person doesn't want to outwardly show an emotion.

In 2013, I became the first police officer to present the results of a polygraph exam during a trial in Beijing. It was in the case of a man accused of killing his child, and I appeared in court to answer questions on the test from judges and lawyers.

Yet I must point out that polygraphs, which are voluntary, are only a reference. Whether the results can be admissible as evidence depends on judicial authorities. I'm not a judge, and I have no right to say whether a person is guilty or not.

Instead, what I can do is ensure tests are conducted in an environment with the right temperature and humidity, and that the emotions of the subjects remain stable. The stricter the process, the more accurate the results.

A good polygraph test also relies on logical, valuable questions - and to ensure we ask those, we need to pay close attention to details from the crime scene.

About 10 years ago, a woman was found bleeding to death in a wasteland about 100 meters from a road in Beijing. A post mortem examination found she had been sexually assaulted.

The prime suspect was asked to take a lie-detector test. I found his psychological signals to be abnormal during the examination, but to make it more accurate, I asked him: "Did it rain at the time of the assault, or did you see someone or a car pass by?" I'd seen in the case files that one of the victim's shoes had been found on the road, suggesting she had been taken from there to the wasteland.

To my surprise, the suspect suddenly turned to look at me. His face had no expression, but his physiological signals began fluctuating wildly at the mention of a car. Later, he told me he had dragged the woman onto the wasteland after spotting an approaching car.

Questions can sometimes stimulate people, and sometimes not. Ultimately, polygraph tests are playing a bigger role in helping investigators find more clues. That's why I'm so passionate about the work and want to study it further.

Editor's picks
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 欧美性色xo影院在线观看 | 欧美一级性 | 一区二区三区四区在线视频 | 免费特黄一级欧美大片在线看 | 日本在线加勒比 | 在线欧美精品二区三区 | 精品一区二区三区五区六区 | 国产在线观看网址你懂得 | 欧美日韩高清不卡一区二区三区 | 久久久久久久性高清毛片 | 午夜影院a | 久久福利资源国产精品999 | 国产精品久久久久久小说 | 欧美成人免费网在线观看 | 伊人久久国产免费观看视频 | 日韩一页| 欧美自拍视频在线 | 欧美成人精品第一区 | 最近中文字幕在线 | 中文 | 亚洲欧美日本国产 | 国产三级精品播放 | 国产亚洲欧美在线视频 | 2021精品国产品免费观看 | 毛片免费全部免费播放 | 美女一级ba大片免色野外 | 久久综合久久综合九色 | 欧美一级高清片免费一级 | 欧洲成人免费视频 | 日韩视频在线观看中字 | 欧美日本在线三级视频 | 久久99国产精品 | 国产午夜精品免费一二区 | 白浆在线视频 | 97国产精品欧美一区二区三区 | 激情一区二区三区成人 | 国产伦一区二区三区四区久久 | 久久国产成人精品 | 国产韩国精品一区二区三区 | 国产欧美日韩在线观看一区二区三区 | 国产美女主播一级成人毛片 | 精品国产精品 |