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

WORLD> Global General
DNA evidence can be faked too
(China Daily)
Updated: 2009-08-21 11:44

JERUSALEM: Israeli scientists have developed new technology to fight biological identity theft after realizing that DNA evidence found at crime scenes can be easily falsified.

The researchers showed that with the use of basic equipment and know-how, anyone can obtain artificial DNA that can be incorporated into genuine human blood or saliva, or directly planted at a crime scene.

"Current forensic procedure fails to distinguish between such samples of blood, saliva and touched surfaces with artificial DNA," the scientists wrote in an article recently published by scientific journal Forensic Science International: Genetics.

DNA evidence can be faked too

Elon Ganor is CEO and co-founder of Nucleix, an Israeli company specialized in DNA analysis that conducted the research. She says it doesn't take much to produce large quantities of artificial DNA.

"You can take a used cup of coffee or a cigarette butt, send it to a laboratory, and for a relatively small sum of money have their DNA identified, produced and sent back to you in a test tube," he told AFP.

The DNA samples, which are produced using a standard technique called whole genome amplification, can then be planted at a crime scene.

Related readings:
DNA evidence can be faked too Collection of DNA arouses hot debate
DNA evidence can be faked too DNA databank to trace kidnapped kids
DNA evidence can be faked too Test of Lincoln DNA sought to prove cancer theory
DNA evidence can be faked too Mammoth task: Scientists map DNA of ancient beast

DNA evidence can be faked too Many dangers of unlocking DNA secrets

Researchers at Nucleix also demonstrated how one could implant DNA into real blood by using a centrifuge to separate red and white blood cells and placing the DNA in the former, giving the blood a new profile.

As part of the experiment, a sample of the modified blood was sent to a laboratory in the United States that works with FBI forensic teams, which failed to catch the forgery, Ganor said.

To combat the practice, Nucleix has developed a DNA authentication method that distinguishes between real and fake samples.

"We have come up with a solution that should become an integral part of the standard DNA tests today and seal the hole that has been opened in what has become the gold-standard in forensics," said Ganor.

The new process was tested on natural and artificial samples of blood, saliva and touched surfaces, with complete success, Nucleix said.

It also identifies "contaminated" DNA that has been mixed with two or more samples.

Forensic DNA profiling is today one of the most powerful tools applied on crime scenes, and is often used to convict or acquit suspects in rape and murder cases.

Although most of the DNA sequence is identical in all humans, forensic scientists scan 18 regions on the sequence that vary from person to person, allowing the identification of a single person with extremely high accuracy.

"DNA is in many cases what breaks trial suspects and allows their conviction 'beyond reasonable doubt'," said DNA analysis expert Adam Friedmann, dean of the Marine Science School at Israel's Ruppin Academic Center.

"DNA profiling is an excellent technique that is improving by leaps and bounds," he said.

"There is nearly a 100 percent accuracy in identification," he said, adding that there is less and less need to bring other evidence linking a person to a crime scene.

AFP

主站蜘蛛池模板: 日本精品视频一视频高清 | 日韩av线上| 亚洲系列 | 在线永久免费观看黄网站 | 久久久久久久久久久久福利 | 一级爱爱片一级毛片-一毛 一级爱做片免费观看久久 一级白嫩美女毛片免费 | 亚洲一区二区三区高清视频 | 国产成人成人一区二区 | 中国一级做a爱片免费 | 韩国欧洲一级毛片 | 精品手机在线视频 | 奇米5555| 久久久久久国产视频 | 青青青青爽视频在线播放 | 国产一区二区影视 | 国产精品国内免费一区二区三区 | 欧美一级特黄aaaaaa在线看片 | 亚洲午夜久久 | 久久com | 日本一区午夜爱爱 | 亚洲一区不卡 | 成 人 黄 色 大 片 | 2018av男人天堂 | 国产精品亚洲精品久久成人 | 亚洲一区二区免费看 | 欧美精品区| 久久国产精品99久久久久久牛牛 | 欧美丰满大乳大屁股毛片 | 欧美日韩国产亚洲一区二区三区 | 97国产在线观看 | 欧美在线成人午夜网站 | 国产精品激情丝袜美女 | 国产aⅴ一区二区 | 亚洲精品成人久久久影院 | 亚洲 欧美 视频 | 女人国产香蕉久久精品 | 91精品观看91久久久久久 | 日韩国产精品欧美一区二区 | 欧美成人影院 在线播放 | 久久久久久色 | 国产精品欧美亚洲韩国日本 |