Case (cite)
State v. Hackett, 55 S.E.2d 696 (S.C. 1949)
Very detailed description by the expert of his methods with a few interesting quotes about firearms identification, but the anlaysis was focused on the use of circumstantial evidence, not on the firearms testimony.
“It is now common knowledge that by means of the science of ballistics, it may often be determined that a bullet was fired from a certain pistol, and it is the modern tendency of our courts to allow the introduction of expert testimony to show that the bullet which killed the deceased was fired from a particular pistol or rifle, where it is first definitely shown that the witness by whom such testimony is offered is, by experience and training, qualified to give an expert opinion in the field of ballistics. 22 C.J.S. Criminal Law, § 565, page 876; 26 Am.Jur., § 440, page 460. The weight of such testimony is for the determination of the jury.”
Quote from expert: “‘It has found by scientific tests that it is not possible for two weapons to exist that impart the same pattern of microscopic markings. It is similar in this respect to finger printing examination where it has not yet been found that any two persons have identical finger prints. The same is true of weapons, each leaves its own identifying marks characteristic to that weapon alone and no other weapon can impart similar markings.’”