Then read this book to see what is possible.
Entanglements of HypoVereinsbank (now UniCredit) in extensive corruption.

Negligence and arrogance of the judicial system
No one believed his story about his wife’s black money dealings while she worked as a banker. Instead, it was used as evidence of his confusion and paranoia. Years later, it became clear: Mollath had been telling the truth.
https://www.welt.de/politik/deutschland/article226825431/Der-Fall-Gustl-Mollath-Man-wollte-ihn-mundtot-machen.html