Case (cite)
Sexton v. State, 93 S.W.3d 96 (Tex. Crim. App. 2002)
These references may support the general theory of using toolmarks for connecting cartridges generally, but it does not support the particular application in this case.
This record qualifies Crumley as a firearms identification expert, but does not support his capacity to identify cartridge cases on the basis of magazine marks only.