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In page Fred A. Leuchter:
"Leuchter did not examine the walls of the gas chambers until 50 years after they had been used; his critics note that it would have been virtually impossible to discover any cyanide at all using his method. In fact, tests conducted on ventilation grates immediately after the end of the war showed substantial amounts of cyanide. The chambers were demolished by the Nazis when they abandoned Auschwitz, and the facilities Leuchter examined were, in fact, partially reconstructed. Leuchter was unaware that parts of the camp and chambers had been reconstructed, so he had no way of knowing if the bricks he was scraping had actually been used in the original gas chamber.[citation needed]
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