Kernrechtsfrage
Whether the public law appeal was admissible against the cantonal interlocutory decision
Extrahierter Entscheid
The appeal was inadmissible because the challenged decision was incidental and no irreparable legal harm was shown.
Extrahierte Begründung
The accused could still raise the use of the letter as evidence before the trial court, which could exclude unlawfully obtained evidence; therefore any harm was not irreparable within the meaning of Art. 87(2) OJ.