Question juridique clé
Whether the federal criminal complaint against the cantonal interim decision was admissible under Art. 93 BGG.
Solution extraite
The complaint was inadmissible because the challenged interim ruling did not cause an irreparable legal disadvantage and could not immediately lead to a final decision.
Motifs extraits
A decision allowing a person to participate as a party in the investigation does not create irreparable legal harm for the accused; mere procedural burden is insufficient.