CURIAM. This case is before us on a petition for writ of certiorari from an order declaring a mistrial and excluding the testimony of the state’s key witness, Gregory Glover, in the trial of Andreas Scheus-chner. See State v. Pettis, 520 So.2d 250 (Fla.1988) (<HOLDING>). The trial court declared a mistrial and
holding that certiorari petition is appropriate to review nonfinal pretrial evidentiary order in criminal case holding that likelihood of irreparable harm must be based on evidence in the record not unsupported and conclusory statements regarding harm the plaintiff might suffer holding that the district court erred when it failed to consider the presumption of irreparable harm holding the collateral order exception does not apply to a pretrial order denying class certification because the order is subject to revision prior to a decision on the merits holding the district courts of appeal have the ability to review a pretrial evidentiary order where the state would suffer irreparable harm if the order were not reviewed