Groups such as the Hamamatsu Medical College legal medicine room (Prof. Osamu Suzuki) and Shiga University brought the research result of assumption that the person who had the renal dysfunction became an acute encephalopathy eating and the hydrogen cyanide (hydrocyanic acid) was detected from Sgihiratake of which the dead went out, too together. It announced at the poisoning of a Japanese method of holding society in Fukuoka City on the 27th. Eringi and Maitake, etc. are known as a mushroom that contains very small amount hydrocyanic acid. Kenmori Kunio Hamamatsu Medical College assistant of the experiment group assumes, "As for the detection of the hydrocyanic acid from Sgihiratake, the causal relation between the content and the acute encephalopathy has not been understood yet though the first time". The group made it evaporate heating Sgihiratake, and when having examined it with the mass spectrometer, data that showed the existence of the hydrocyanic acid was displayed. Because time had passed from the collection as for the sample used to experiment, the amount of the hydrocyanic acid is not measured, and scheduled to measure it in detail with a new sample this autumn. It is said that 1/1000 or less of the fatal doses the hydrocyanic acid included in my Take doesn't have the problem as for food.