DNA evidence in the O. J. Simpson murder trial

Common card · No. 229199

With no witnesses to the murders of Nicole Brown Simpson and Ron Goldman, DNA evidence in the O. J. Simpson murder trial was the key physical proof used by the prosecution to link O. J. Simpson to the crime. Over nine weeks of testimony, 108 exhibits of DNA evidence, including 61 drops of blood, were presented at trial. Testing was cross-referenced and validated at three separate labs using different tests with no discrepancies found. The prosecution offered the defense access to the evidence samples to conduct their own testing, but they declined. The defense summarized their reasonable doubt theory as "compromised, contaminated, corrupted". They argued that, during the collection phase of evidence-gathering, the evidence was compromised by mishandling and 100% of the DNA of the real killer was lost; and then contaminated during the processing phase, with Simpson's preserved DNA being transferred to all but three exhibits. They alleged that the remaining three were corrupted as the police...

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