People v. Fiorita, 170 N.E. 690 (Ill. 1930)

he trial court also allowed a witness to testify as a ballistics expert. The witness had never been formally trained in ballistics. He testified that the bullet taken from the victim matched a bullet in a gun found in a hotel room defendant was in, which was not rented by him. On appeal, the court held that the trial court erred in admitting the ballistics expert's testimony because the witness was not qualified to testify as an expert. It also found that the evidence did not establish beyond a reasonable doubt that defendant had participated in the robbery and murder.