Question juridique clé
Whether the challenged mutual legal assistance decision had to be annulled because the appellant was not fully heard and not given access to all decisive files.
Solution extraite
Yes. The right to be heard was violated, the defect was formal, and the decision had to be set aside regardless of the merits.
Motifs extraits
The authority itself admitted that relevant documents had not been disclosed or commented on. Under the case law, a hearing violation normally leads to annulment; cure before the Federal Supreme Court was not appropriate because the deciding authority had broader discretion than the court.