Question juridique clé
Whether the federal criminal appeals against an incidental cantonal decision were admissible under Art. 93 LTF.
Solution extraite
The decision was incidental and did not cause irreparable legal harm; the exception for avoiding lengthy and costly evidence proceedings was not met in this criminal case.
Motifs extraits
In criminal matters, Art. 93(1)(b) LTF must be interpreted restrictively. The ordered additional technical and medico-technical expert evidence was relevant and not superfluous; avoiding expense could not outweigh the duty to prosecute and the court's freedom to assess evidence.