According to the unpublished 1916 autopsy report by Professor Kossorotov, as well as subsequent reviews by Dr. Vladimir Zharov in 1993 and Professor Derrick Pounder in 2004/05, no active poison was found in Rasputin's stomach. A possible explanation would be that the cyanide in the cakes had vaporized due to the high temperatures during the baking in the oven.
It could not be determined with certainty that he drowned, as the water found in his lungs is a common non-specific autopsy finding. All three sources agree that Rasputin had been systematically beaten and attacked with a bladed weapon, but, most importantly, there were discrepancies regarding the number and caliber of handguns used.