Key legal question
Whether the appeal against the cantonal decision was admissible before the Federal Supreme Court under Art. 84 BGG.
Extracted holding
The appeal was inadmissible because the appellant did not show that the case was particularly significant, as required for mutual legal assistance matters involving secret information.
Extracted reasoning
In mutual legal assistance in criminal matters, the ordinary remedy is not a criminal-law appeal but an appeal in public law matters. Under Art. 84 BGG, review is limited to special cases, and Art. 42(2) BGG requires the appellant to explain why this threshold is met. That was not done.