Key legal question
Whether the federal criminal complaint against the cantonal interim decision was admissible under Art. 93 BGG.
Extracted holding
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.
Extracted reasoning
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.