Notes From A Criminal Investigation 7 Chapter 40

Owen secretly sighed: "After searching everywhere for something, it is easy to find. Cheng Sen's father Cheng Mangzi beat his wife, and Zhao Daiyong also beat his wife. Domestic violence is hereditary and contagious. Zhao Daijun and Cheng Sen are very likely to commit domestic violence. This may be an important reason why Yang Mei and Jing Hong are indifferent."

People's behavior patterns are acquired from two aspects: one is innate, from genes. Aggression and violent tendencies can be inherited through genes. The other is from family education and social education. When a child is harmed by domestic violence from an early age, he may turn around and commit violence against others when he grows up because he is used to speaking with his fists. Minors living in violent families are very different from those in normal families in terms of physiology, psychology and expression ability.

After leaving Zhang Jiajing's house, everyone was quiet for a while, and no one spoke first. When they came to the front of the car, Qin Dongjiang said: "Domestic violence is a very important clue. Why didn't the investigators in Huzhou find it? This is a bit incredible."

Lu Keying said awkwardly: "Yang Mei was abused, but she didn't say anything. Jing Hong was abused, but she didn't say anything. Zhao Daijun and Cheng Sen were killed, so they naturally wouldn't say anything. Only a few people knew the inside story of these two couples, so they ignored the domestic violence during the investigation. No matter how many reasons there are, this is the dereliction of duty of our Huzhou criminal police."

Having caught the fox's tail, Owen finally smiled and said, "This is the special feature of this case, otherwise it would not have been unsolved for so long."