Question juridique clé
Whether the complaint against the interlocutory order allowing foreign officials to attend the witness hearing was admissible despite the alleged irreparable harm.
Solution extraite
The complaint was inadmissible because passive presence of foreign officials did not, on the facts, create an immediate and irreparable prejudice.
Motifs extraits
Under the mutual assistance rules, irreparable harm from foreign attendance exists only exceptionally, especially if foreign participants may actively question the witness or access secret information prematurely. Here the Swiss authority would conduct the questioning, safeguards would prevent premature use of information, and the appellants did not plausibly show otherwise.