ID SPOOFING WITH DNA. “It is possible to fabricate DNA evidence. The scientists fabricated blood and saliva samples containing DNA from a person other than the donor of the blood and saliva. They also showed that if they had access to a DNA profile in a database, they could construct a sample of DNA to match that profile without obtaining any tissue from that person. “You can just engineer a crime scene … Any biology undergraduate could perform this.””
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http://www.nytimes.com/2009/08/18/science/18dna.html?_r=0