Douglas Perkins, the retired leader of the Oklahoma State Bureau of Investigation's trace evidence unit, testified he examined the blanket and found four holes.
If the blanket was folded and held in front of the gun as investigators suspect, it would have prevented blood spatter from traveling back toward the shooter, Perkins said.
“The multiple layers of fabric will routinely trap the gas pressures in the blanket that might otherwise cause spatter,” Perkins said.
Previous witnesses testified about sexual encounters Becky Bryan had in the days leading up to the shooting and her contact with a former lover who ended an extramarital affair with her in 2010.
Testimony is scheduled to continue throughout Thursday.