I think consensus amongst scientists is always difficult to achieve.

My understanding is that it was accepted that John Demjanjuk was not Ivan the Terrible of Treblinka. The documentary "Devil Next Door" presented a range of evidence supporting this. This evidence included but was not limited to:

• documents showing that Ivan the Terrible‘s last name was Marchenko (not Demjanjuk);
• documents stating that Ivan Marchenko had brown eyes (Demjanjuk‘s eyes were blue);
• statements from E. Rosenbaum in the 1940s, claiming that he had killed Ivan the Terrible during the Treblinka uprising of 1943.

Due to this reasonable doubt that John Demjanjuk was Ivan the Terrible of Treblinka, Israel‘s Supreme Court acquitted him.

The documentary does not do a very good job of discussing the various trials. I‘m a native German speaker, I remember Demjanjuk‘s trial in Germany despite not living here at the time. I‘m also a psychologist by training.

Germany‘s trial of Demjanjuk was exclusively focused on ACCESSORY TO murder at Sobibor. There were no witnesses who actually saw him murder anyone so he couldn‘t be tried for murder. The Treblinka matter was not part of the German trial at all.

And now, here‘s my two cents. It‘s a scientifically proven fact that human memory is extremly fallible and easily manipulated. This counts for every single one of us. Google for the work of Elizabeth Loftus, particularly regarding a certain plane crash in Amsterdam. You‘ll see what I mean. This means to me that I place more faith in the signed, contemporaneous documents that show that Demjanjuk was NOT Ivan the Terrible than I place in eyewitnesses, interviewed 40 years later.