The investigator has inspected the facilities at Auschwitz, Birkenau and Majdanek, made measurements, taken forensic samples, reviewed design and procedural literature on DEGESCH delousing chambers and procedures, Zyklon B gas, and materials on execution procedures. Much of the reviewed material was literature purchased and viewed at the sites in Poland, including copies of original drawings of Kremas I, II, III, IV and V.