State v. Mack, 653 N.E.2d 329 (Ohio 1995)

Defendant argues that expert should not have qualified as an expert and that his testimony was based on hearsay of others. The court held that under 702 the expert was qualified. The expert had performed other firearms examinations, was well-trained, and belonged to the professional organization for firearms examiners, and had testified over 60 times as an expert. Further, given that the expert performed his tests, the court held that his testimony was based on his own personal knowledge. The court also held that the expert's colleagues confidmation of his findings do not render his opinions hearsay