 Sims denied this stating that none of the 108 exhibits tested showed evidence of contamination and also mentioned the defense was offered the chance to test the evidence samples for contamination themselves but they declined.Gary Sims testified again on May 31 and had the jurors look at the socks from Simpson's bedroom with their naked eye and then through a microscope.The purpose of this demonstration was to show the blood stains were only visible under a microscope.