 If that did not happen, contamination would only produce a mixture of Simpsons DNA and the killers.The contamination claim likewise would spread EDTA to the evidence samples which could be tested for as it was a preservative found in the reference vials of Simpson and the two victims.The contamination claim was also limited to just the LAPD crime lab as it was not alleged at the two consulting labs, the state department and Cellmarks diagnostics, were most of the DNA testing was done.