"Severe mental illness is actually what the general public calls mental illness, and it is also a narrow definition of mental illness. Qiu Lan looked at the information in her hand, "The brain of a person with this disease is not clear, and all behaviors are uncontrollable. ”

"But this medical record has been in place for so many years, and it was diagnosed before she and Zeng Qipeng got married, so how could Zeng Qipeng marry a woman with mental illness?" Qiu Lan frowned, with a question mark in her heart.

After listening to her analysis, Xu Chengyan nodded and echoed softly: "This is indeed a suspicious point, the suspect's family background should have been good before, and he suddenly got married, and there was no ceremony, but he just registered a record, which is indeed suspicious." ”

"Hmm. Qiu Lan stared at the document with a thoughtful look.

Suddenly, she remembered the document sent by Xiao Cong just now, and her eyes flashed slightly, "Officer Xu, you came just in time, I was still discussing the girl's bones with Xiao Cong just now, and I found something suspicious." ”

Qiu Lan turned around, clicked on the file on the computer, and slid to the page of the identification results, "You see, Xiao Cong had made an inversion mold for the deceased's tooth socket before, and then matched the twenty teeth found at the scene one by one, and found that one should not belong to the deceased." ”

"Doesn't belong to the deceased?" Xu Chengyan frowned, the expression on his face stiffened a little, and there was a hint of doubt on his eyebrows, "If it's not the deceased, who will it be?"

"I have already asked Xiao Cong to take the tooth to the forensic department, and the result should be available when they finish the test, but I preliminarily judged that it was an adult's tooth, Zeng Qipeng's tooth was intact, and it should not be his. Qiu Lan pursed her lips, her eyes heavy.

"Could it be?" Xu Chengyan stared at the content on the screen suspiciously, and said softly: "Is it Zhang Yunmei's?"

"That's what I guessed, because it was brought back with the girl's bones. Qiu Lan took a deep breath, took advantage of her chin with one hand, and calmly analyzed, "Wait for the forensic department to extract the DNA in the teeth and compare it." ”

"However, if this tooth is really the real mother of the deceased, then I guess she has already been killed. ”

Xu Chengyan, who was standing on the side, lowered his eyes, carefully thinking about all the information of the case in his mind, and his lips couldn't help pursing, "Now all the evidence points to Zhang Yunmei, but the only one who has come into contact with her is the suspect Zeng Qipeng." ”

But there was no way to ask about Zeng Xiaoqi and Zhang Yunmei from his mouth at all. ”

Qiu Lan bit her lip lightly, frowned slightly, and lowered her head in contemplation.

She remembers that when she was in college, she had heard a lecture by a foreign psychologist about the problem of mental imbalance caused by strong stimuli.

According to the information from the investigation of the case, Zeng Qipeng had no mental illness before, but then he suddenly became a mentally disturbed person for some reason.

At that time, at that special lecture, foreign experts mentioned that in the memory storage area of the brain of a patient with such a mental illness, he would always remember the specific segment that stimulated his nerves.

After that, under a certain moderate amount of the same stimulus, the patient will involuntarily repeat what he did and what he said, because such behavior and thinking are like echoes in the valley, repeating the same words over and over again, so it is called memory echo in psychopsychology.

Perhaps this approach can help with this case.

"Officer Xu, I have thought of a way, maybe I can know something from Zeng Qipeng's mouth. Qiu Lan twitched her lips and looked up at the person in front of her, her tone firm.

Outside the detention ward of the Central Hospital, Qiu Lan found a female nurse that Zeng Qipeng had never met, put on the same type of clothes that he found in his house, and bought a ragdoll about the same length as Zeng Xiaoqi's bones.

However, this puppet doll has a magnified photo of Zeng Xiaoqi pasted on its face.

"Doctor Qiu, is this really okay?" Xu Chengyan frowned, looking at the things in front of him, he couldn't help but have some doubts in his heart.

"I don't know if it will have a specific effect, but this method was mentioned by an expert I once heard, we can give it a try, maybe we can find some clues?"

"And Dr. Lee and I will be around, and if we find something wrong, we can stop immediately. Qiu Lan pursed her red lips, glanced at Li Yaxian next to her, and raised the corners of her lips.

"Yes. Li Yaxian responded with an elegant smile and echoed softly: "Officer Xu, don't worry, this is the echo of the memory proposed by Professor Wendri, but I really didn't expect it to be used to solve the case before." ”

"Okay, let's try it. Xu Chengyan nodded and motioned to his colleagues behind him to open the door of the detention ward.

The female nurse walked into the room holding a puppet doll with Zeng Xiaoqi's portrait on it.

According to the plan, she only needed to inadvertently put the doll in Zeng Qipeng's sight and let him see it.

Sure enough, as soon as the doll was placed at the head of the bed, the man who was originally blank in his eyes immediately noticed her, and his pupils lit up suddenly, "Kiki!"

There was surprise and surprise in his voice, "This is my Kiki, my Kiki, why is it here?"

The doll on the bed was hugged into Zeng Qipeng's arms, he kindly stroked the face of the puppet, smiling, and his voice was soft, "Don't be afraid, Qiqi, dad is here, don't be afraid, I will protect you." ”

Seeing his appearance, Qiu Lan knew that her plan was half successful, she looked at the female nurse in the ward, took out the mobile phone in her bag, and put the radio to her lips, "Go and bring the puppet over, pretend to be angry and beat the child." ”

The female nurse in the room heard the sound from the Bluetooth headset, immediately instructed, strode to the side of the bed, pulled out the puppet doll from Zeng Qipeng's hand, put it on the bed, pretended to be angry, and kept slapping the puppet, "Disobedient, I will make you disobedient!"

"I'll kill you, I'll kill you!"

"You, don't hit Kiki, don't hit Kiki!" Zeng Qipeng was stunned in place, his hands hovering in the air, and he was so anxious that he kicked his feet.

It can be seen that he wants to go up to save Zeng Xiaoqi, but there is an inexplicable sense of fear in his eyes, as if he will be afraid of the woman who beat the child in front of him.

"Kill you, I'll kill you, I'll make you disobedient!" The female nurse continued to move while keeping an eye on the person next to her, "Kill you little rabbit!"

"Don't, don't fight. Zeng Qipeng was so anxious that his body trembled, he took a few steps forward but didn't dare to stop it, his eyes were flustered, and he kept muttering in his mouth, "Qiqi is still young, still young, don't hit her, don't beat her!"

He stood there in fear, his brows furrowed, and his heart ached, but he was so frightened that he didn't dare to step forward, so he could only murmur in a low voice beside him.

"Angry, throw the puppet away and throw it at the wall. Qiu Lan stared at the scene in the room and commanded in a low voice.

The female nurse heard the words in the earphones clearly, picked up the puppet, threw it heavily on the wall, and roared angrily: "If you are disobedient, I will kill you, I will see if you dare not listen to me in the future." ”