The CRL states:
"The armor parts shall be made from one of these types of materials or like materials: White fiberglass, ABS (Acrylonitrile Butadiene Styrene), HIPS (High Impact Polystyrene), or Polyvinyl chloride (PVC)"
Even so I think it would be hard to be accurate enough to pass with pep. It also sounds like hard to wear.
Sorry!
-Eric