Tuesday, August 18, 2009

Scientists Learn To Fabricate DNA Evidence

"The NY Times reports that it is possible to fabricate blood and saliva samples containing DNA from a person other than the donor, and even to construct a sample of DNA to match someone's profile without obtaining any tissue from that person — if you have access to their DNA profile in a database. This undermines the credibility of what has been considered the gold standard of proof in criminal cases. 'You can just engineer a crime scene,' said Dan Frumkin, lead author of the paper. 'Any biology undergraduate could perform this.' The scientists fabricated DNA samples in two ways. One requires a real, if tiny, DNA sample, perhaps from a strand of hair or a drinking cup. They amplified the tiny sample into a large quantity of DNA using a standard technique called whole genome amplification. The other technique relies on DNA profiles, stored in law enforcement databases as a series of numbers and letters corresponding to variations at 13 spots in a person's genome. The scientists cloned tiny DNA snippets representing the common variants at each spot, creating a library of such snippets. To prepare a phony DNA sample matching any profile, they just mixed the proper snippets together. Tania Simoncelli, science adviser to the American Civil Liberties Union, says the findings were worrisome. 'DNA is a lot easier to plant at a crime scene than fingerprints,' says Simoncelli. 'We're creating a criminal justice system that is increasingly relying on this technology.'", in slashdot.

E pronto, lá se vai o CSI :oP

Como será então a partir de agora? Será que se vão começar a safar por "falta de provas irrefutáveis"?


  1. rofl... A partir de agora os advogados de defesa vão alegar que as provas foram "construídas" e estão a inventar provas contra o arguido. E pronto muitos verdadeiros culpados vão parar à rua outra vez.

  2. Ya, lá se vai a justiça por água abaixo ;o)

    Isto é uma descoberta espectacular mas problemática!