Question juridique clé
Whether the public law appeal was admissible against the cantonal interlocutory decision
Solution extraite
The appeal was inadmissible because the challenged decision was incidental and no irreparable legal harm was shown.
Motifs extraits
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.