Zurich prosecutors are in a quandary with a more than year-old investigation into Pierin Vincenz, an influential Swiss banker who until 2015 ran cooperative lender Raiffeisen. Investigators have been unable to evaluate reams of evidence grabbed in several raids including documents, computer hardware, and smartphones, Swiss weekly «NZZ am Sonntag» (behind paywall, in German) reported.

The evidence was sealed following a legal intervention by those being investigated, which would be Vincenz and long-time associate Beat Stocker, the newspaper reported. Prosecutors are attempting to get the evidence released through legal means. The move to seal evidence can under certain circumstances be prolonged until the statute of limitations on their alleged wrong-doing lapses.