Can I challenge an MLA request before my documents or testimony are transmitted abroad?

In several jurisdictions, affected parties have standing to contest MLA execution before evidence leaves the country. Switzerland grants formal party status to account holders and document owners, allowing appeals to the Federal Criminal Court within 30 days of notification. Germany and Austria similarly permit judicial review. Successful challenges typically involve demonstrating procedural irregularities, lack of dual criminality, violations of specialty principles, or human rights concerns. Timing is critical—once evidence is transmitted, recovery is virtually impossible, and the requesting state gains full control over its use.