In State v. Hall, 174 W. Va. 787, 329 S.E.2d 860 (1985), the Court concluded that failure of the State to disclose a prior inconsistent statement made by one of the prosecution's witnesses violated due process of law where the statement was inconsistent with the witness's trial testimony, where the witness's credibility was the most important issue in the case, and where a reasonable doubt might have been created by impeachment of that witness.