Chapter 10 Section IX

"Criminal Investigation One, No. 154, No. 9. March 22, Showa 23. "Minister of Criminal "According to the investigation of the imperial bank poisoning case, with the great assistance of the government and the people across the country, it has been carried out for 57 consecutive days, but no conclusive information on the prisoner's whereabouts has been obtained. It is rumored that the investigation of this case is in trouble, causing Relevant personnel wandered astray. For this case with such a wealth of data, it is absolutely impossible to make a pessimistic guess after only a few decades of investigation.”

The investigating authorities thus encouraged the headquarters and the various police stations to add the following precautions to the investigative outline: "In the investigation of suspects, special attention should be paid to the following two types of persons: "1. A person with academic qualifications, qualifications, knowledge, skills and experience in medicine or physics and chemistry. "2. People who used to be in special schools, research institutes or affiliated teaching teams, epidemic prevention water supply teams, and military police and secret service agencies (mainly those above the rank of lieutenants) who used to handle medicines in the old military headquarters."

On June 25, the investigation finally entered a tense stage.The following paragraphs are excerpts from investigative instructions issued on behalf of the Minister of Criminal Affairs.The preceding paragraph is extremely instructive. "Over the past 152 days, all the police departments have worked tirelessly to continue the investigation of the 'Imperial Bank incident'. They have been looking for suspects for several days, and they have worked hard to study them. They are very effective. I am very grateful. The investigation headquarters is also under the situation of growing morale. Investigations have been launched in various aspects. This time, the work of vigorously reducing the investigation network has been completed, and part of the investigation policy has been shifted to a new direction." (The author added the point.)

"The former military department is the most suspicious because: "First, it can be concluded that the murderer has full confidence in the amount and effect of the poison. "The poison used by the murderer in the Reichsbank is a cyanic acid compound solution with a concentration of 5% to 10%. The amount he gave each person to drink was about 5 milliliters. Calculated from the chemical composition, the above liquid contains zero 0.2g to 0.5g of pure potassium cyanide (or sodium cyanide) is almost equivalent to the lethal dose of potassium cyanide (0.3g to 0.5g), which shows that the murderer tried to use the minimum amount (stimulant) ) to achieve the goal. Especially the murderer put the liquid prepared to kill sixteen people in a children's medicine bottle that can only hold 120 milliliters, and use a glass tube that can suck 2 milliliters to accurately measure the drops twice before and after into each cup. Considering the above, it can be seen that the murderer has a certain confidence in the quantity and effect of the medicine. If this confidence is lacking, he will make the medicine thicker, or increase the quantity, and thus show his weakness. , to show that he is an outsider. So this cannot be easily dismissed as an accidental agreement.