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Investigators turned to forensic analyst robert shem. he test fired an hk-91 into a piece of metal the same thickness as the road sign. then using a rubber-like casting substance called microsil, he made impressions of the bullet holes in the road sign and those produced by his test firing of the same type of gun. the castings were compared under a microscope. >> once i removed the rubber, i was able to establish that the holes in the sign were indeed 0.30 caliber, and they possessed the same rifling characteristics as an hk-91. >> the test proved kerr's claim that the boys were using an hk-91...

With three bullet holes. to test kerr's story, investigators turned to forensic analyst robert shem. he test-fired an hk-91 into a piece of metal the same thickness as the road sign. then using a rubber-like casting substance called microsil, he made impressions of the bullet holes in the road sign and those produced by his test firing of the same type of gun. the castings were compared under a microscope. >> once i removed the rubber, i was able to establish that the holes in the sign were indeed .30 caliber, and they possessed the same rifling characteristics as an hk-91. >> the test proved ...

Thickness as the road sign. then using a rubber-like casting substance called microsil, he made impressions of the bullet holes in the road sign and those produced by his test firing of the same type of gun. the castings were compared under a microscope. >> once i removed the rubber, i was able to establish that the holes in the sign were indeed 0.30 caliber, and they possessed the same rifling characteristics as an hk-91. >> the test proved kerr's claim that the boys were using an hk-91 that day. but could investigators prove the shooting was intentional? the fatal bullet entered the car thro...

Investigators found that sign with three bullet holes. to test kerr's story, investigators turned to forensic analyst robert shem. he test fired an hk-91 into a piece of metal the same thickness as the road sign. then using a rubber-like casting substance called microsil, he made impressions of the bullet holes in the road sign and those produced by his test firing of the same type of gun. the castings were compared under a microscope. >> once i removed the rubber, i was able to establish that the holes in the sign were indeed 0.30 caliber, and they possessed the same rifling characteristics a...