 The defense claimed that Yamauchi lied when he said he changed his gloves and did handle items with his gloved hands and transferred Simpsons DNA to the evidence items from the reference vial.Yamauchi denied this, stating that before and after each evidence item is tested a blank sterile control swatch is run to determine if cross contamination like that occurred and all of the controls were negative.Yamauchi also pointed out the defenses DNA expert Henry Lee did not change gloves either when he examined the evidence items.