According to the latest issue of TIME Magazine (Aug. 31, 2009): "Making one person's blood and saliva appear to have been taken from someone else is so simple, Israeli scientists found, that a biology student could do it. In a startling experiment, the researchers faked DNA using multiple techniques. In one, they replaced the DNA in a blood sample with that of another person, collected from hair or saliva. In another, they drew on DNA profiles in law-enforcement databases to construct a sample without obtaining any real DNA from a person. Their findings may undercut the viability of genetic evidence in the courtroom."
http://www.time.com/time/magazine/article/0,9171,1917723,00.html
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