 Dr. Fredric Rieders, a forensic toxicologist, testified on July 24, 1995 and again on August 14, 1995.During Direct examination he testified the results Agent Martz reported showed that EDTA was found in Simpsons blood drop on the back gate at Nicole Brown's home and Nicole Brown's blood drop on the sock in Simpson's bedroom.Using a reference article from the EPA, he testified that because the amount of EDTA in that blood is measured in "parts-per-million" (PPM) and the reference article states normally EDTA in the blood should only be detectable in "parts-per-billion" (PPB), the evidence blood contains a thousand times more EDTA than it should.