Many aspects of Gerstein's testimony are unquestionably problematic. [In making] statements, such as the height of the piles of shoes and clothing at Belzec and Treblinka, Gerstein himself is clearly the source of exaggeration. Gerstein also added grossly exaggerated claims about matters to which he was not an eyewitness, such as that a total of 25 million Jews and others were gassed. But in the essential issue, namely that he was in Belzec and witnessed the gassing of a transport of Jews from Lwow, his testimony is fully corroborated.... It is also corroborated by other categories of witnesses from Belzec.
