Questão jurídica principal
Whether the cantonal decision refusing evidence can be appealed as an interim decision.
Decisão extraída
The challenged decision was an interim evidentiary ruling and did not meet the requirements for immediate federal appeal.
Fundamentação extraída
The order did not end the criminal investigation. It concerned evidence-taking only and did not cause an irreparable legal prejudice; the exception for costly, extensive evidence proceedings also did not apply.