Famous German spy Werner Mauss was found guilty of tax evasion last Thursday after failing to provide a key witness: an Israeli Mossad agent. The agent, who was referred to in all legal discussions about him as "Mr. Adam," was supposedly able to testify that Mauss's offshore accounts were meant to support his undercover work for various spy agencies, including the Mossad, which also deposited money into the account.

The accounts contained 50 million Euros, and led to a year-long trial after they were exposed in the Panama Papers and the German daily Süddeutsche Zeitung.

In August, the German news site RuhrNachrichten reported that an Israeli Mossad agent who was involved in the working relations between Germany and Israel was meant to appear in court and verify Mauss's claim that the money in the offshore accounts was linked to top-secret work.

However, the Israeli declined to appear in the German court, as doing so would be a breach of Mossad security protocol. He offered instead to fill out an affidavit if one would be sent to Israel and approved by his department before he answered it.

The German court rejected the offer, as it had no way of verifying who would actually be providing them with this information.