A laboratory at Nucleix, a life-sciences company, was able to manufacture DNA that would be accurate enough to pass forensic scrutiny:
Fortunately, the company offers a solution: one particular methyl group appears in naturally-occuring DNA, but not in Nucleix's product.
http://www.scientificamerican.com/blog/60-second-science/post.cfm?id=lab-creates-fake-dna-evidence-2009-08-18
"You can just engineer a crime scene," Nucleix founder Dan Frumkin told The New York Times. "The current forensic procedure fails to distinguish between such samples of blood, saliva, and touched surfaces with artificial DNA, and corresponding samples with in vivo generated (natural) DNA," Frumkin and co-authors wrote in a recent Forensic Science International: Genetics study that announced the technological achievement.
Fortunately, the company offers a solution: one particular methyl group appears in naturally-occuring DNA, but not in Nucleix's product.
http://www.scientificamerican.com/blog/60-second-science/post.cfm?id=lab-creates-fake-dna-evidence-2009-08-18
No one said anyone had actually been framed this way, just that it could be done.
Even if it would cost $20million and 10years to fark up a crime scene, the attorneys will be able to scream, "but it MAY.. JUST MAY be possible" and get all DNA evidence thrown out.
Thanks guys at Nucleix... (wonder who's funding THEM??)