How did the comparison microscope make possible modern firearms examination?

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The comparison microscope enabled firearms examiners to compare a side-by-side magnified view of two bullets and thus to determine whether they were fired by the same gun. Bullets fired through the same barrel display comparable markings, called striations, caused by the rifling of the barrel. If
the striations on two bullets viewed through a comparison microscope are alike, the examiner can conclude that both bullets traveled through the same barrel.

Criminal Justice

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