 This time agent Martz tested his own unpreserved blood and found PPM of EDTA, disproving Rieders' claim.Then Dr. Rieders admitted that the EDTA results from Martz's unpreserved blood were similar to the evidence blood drops in question and not even close to levels from Martz's persevered blood from a purple top tube, which had more than a hundred times more EDTA than the evidence samples.The prosecution also produced an article from the FDA showing that not only is EDTA still used in food (which Rieders denied), it is found in the French fries and Big Mac that Simpson ate approximately one hour before the murders.