"It has often been the case that suspects say they worked at Auschwitz but didn't really know what was going on," Jens Rommel, head of the federal office investigating Nazi war crimes, told AFP.
"Legally, the question is about intent: must a suspect have known that people were being taken to the gas chambers or shot? This model is a very good and very modern tool for the investigation because it can help answer that question," Rommel added.