Questão jurídica principal
Whether the refusal to exempt the witness from summons is an immediately appealable interlocutory criminal decision under Art. 93 para. 1 lit. a BGG.
Decisão extraída
No; the witness can still invoke the refusal right before the appellate court, so no irreparable legal harm is shown.
Fundamentação extraída
The appellate court will conduct the witness examination itself, and the witness may assert the statutory refusal right there. Any harm is therefore not irreparable in the legal sense required for federal appeal admissibility.