I quickly flipped through the appraisal report in my hand a few times, and the staff of the appraisal department used the iodine fumigation method for this appraisal. At the end of the nineties, although the method of extracting fingerprint traces by laser irradiation had not yet been used, the trace extraction technology at that time was relatively developed.

In addition to the simplest and fastest physical method of extracting fingerprints with graphite, the commonly used methods for extracting fingerprint traces in judicial identification include silver nitrate method, 8-hydroxyquinoline method, etc., and iodine fumigation method is also a more effective and convenient chemical extraction method. After being fumigated with iodine vapor, colorless fingerprints or traces will appear purple-red, which can make up for the lack of graphite extraction that can not be erased fingerprints or traces.

"I want to see the original!" I said to the appraiser who gave me the report, and he immediately ran over and brought the cup to me. Although I was anxious, I was still cautious, and after putting on my gloves, I cautiously took the cup. The purple-red traces after iodine smoking will slowly disappear over time, and the purple-red lip prints on the cup are already much lighter than those in the photo.

There are three traces on the cup, one is a few finger prints, the identification report says that this is Miao Miao's handprint, and the other is Miao Miao's lip print, from the morphological analysis alone, Miao Miao's lip print is indeed more like what she left before her death, because the lip print also presents a natural blurred movement. And the last trace is a new lip print that we have just discovered, which is a cleft lip.

Miao Miao's lip print is in the middle of the glass, not the mouth of the cup, so it can be concluded that Miao Miao has not drunk this cup of water, and from the direction of the finger print, it also looks like Miao Miao's posture of handing water to someone. The split lip is at the mouth of the cup at the other end of the cup, and the murderer is likely to drink the water that Miao Miao handed him!

"What about the water inside? Have you ever been identified? "I watched carefully for a while, and then I asked the people in the forensic department.

Everyone stood quietly, and Zhao Da kept pacing around anxiously, but he didn't dare to open his mouth to disturb me. The atmosphere was a little tense, and everyone was expecting me to analyze what I would analyze through this cup. When I asked, everyone looked at me in unison, and the person in charge of the identification department stood up.

"Professor Li, it has been identified, but no valid DNA information has been detected." As she spoke, she asked me to flip back the appraisal report, which did record the results of the appraisal, including the cracked lip marks at the mouth of the cup, and all the DNA residues on it had been destroyed, and the method used to destroy the DNA information had not yet been ascertained.

I handed the cup back to the examiners and told them to continue their identification and find out how the killer had destroyed the DNA information on the cracked lip print. There will be some residue of human saliva on human lips, so there will definitely be human DNA, and DNA identification technology has been applied to detection and identification at that time.

Once again, I am sure that the murderer is a person who is very familiar with the investigation and identification procedures of the public security system, and it is precisely because of this that he can arrange such a tight secret room scene and not leave his own traces at the scene. Zhao Da couldn't hold back his anxiety anymore, he opened his mouth and asked what to do next.

When Zhao Da is calm, he still has great leadership skills, but as long as he is in a hurry, he will not know anything. I was a little helpless and asked him, "What else can I do?" In the whole city, through the grassroots police, auxiliary police and special services, search and investigate patients with cleft lip, but do not startle the snake, secretly investigate and supervise, find suspicious people, and make urgent arrests. ”

Zhao Da clapped his hands, and immediately asked people to implement what I said, within the scope of the police, G City has strengthened patrols as much as possible, the entire G City is so big, looking for a patient with a cleft lip is tantamount to looking for a needle in a haystack, but we can only prevent it in this way at the moment.

When we exited the office of the Identification Department, Zhao Da and I found Shen Nuo leaning against the door, and she should have heard what we just said. Zhao Da glanced at me and immediately scolded Shen Nuo: "Didn't you say that you are not allowed to approach the confidentiality of the case before the official report!" ”

Shen Nuo didn't care very much, and still stuck out his tongue symbolically: "You guys don't close the door when you talk by yourself, what can I do." Besides, zero o'clock has passed, and today I will officially be a member of the police force! Shen Nuo said, and deliberately stretched out his hand and shook the watch in her hand at Zhao Da.

I subconsciously glanced at the time, and sure enough, it was already a quarter of a minute. Shen Nuo's words made me and Zhao Da feel a little heavy, and before I knew it, another day had passed, and there were only two days left before the murder that the murderer said.

Shen Nuo saw that we suddenly stopped talking, and asked us what was wrong, Zhao Da sighed, and beckoned Lao Zhang very impatiently. Zhao Da told Lao Zhang that Shen Nuo would hand it over to him for the time being, and Lao Zhang seemed to like Shen Nuo's child very much, so he didn't refuse, and immediately agreed.

Shen Nuo's mouth was also sweet, and he quickly pulled Lao Zhang aside and didn't know what to talk about. Before going back to the hotel, I went to see Sun Hui again, he was sleeping quietly, and there were several criminal policemen guarding him. The night was a little cold, and the hotel was only a few minutes away from the police station, Zhao Da was going to send someone to see me off, but I refused.

It was a time when the police force was empty, and everyone was working all night to study the case, and I didn't want them to waste unnecessary time and energy on me. The door of the hotel was closed, leaving only a small door on the side, and I went in to find that there was only one lamp inside, and the waiter at the counter was sleeping on the counter.

The corridor of the hotel is very dark, and every step I take, the sound of leather shoes stepping on the concrete floor will echo in the hotel for a long time.

I went up to the second floor, and there was a detective standing outside the door of my room and my mother's room, and when he saw me return, he saluted me. He told me that he and another police officer lived next door and would take turns guarding our door. His eyes were bloodshot, during this time, the entire police force was working overtime, and now he had to guard his mother again, and he definitely didn't sleep well.

"In the future, when I am here, you can go and rest, and when I go out, I will call you again." I thought about it and made this decision, they are next door, if there is anything, I just call them. There is a lot of traffic in the hotel, and there are surveillance cameras, so it is impossible for the murderer to come to the door so blatantly.

At first, he refused, saying that he was afraid that Zhao Da would blame, but under my repeated insistence, he still went back to his room to sleep.

I was a little tired, rubbing my head, and just wanted to open the door, when suddenly there was a hot breath from the earlobe, and it was this feeling again. Suddenly, a shadow appeared on the door of the room, and the man was behind me, reaching out to me. The feeling of danger came to me, and without hesitation, I turned around and grabbed the man's arm, pressed his shoulder and pressed it to the ground, and the man snorted.

I finally saw her face clearly, it turned out to be Shen Nuo, she was being pressed to the ground by me, half of her face was facing me, she was panting for breath, her eyes squinting at me. I frowned, "It's you again?" ”

"You let me go first!" Shen Nuo struggled a few times, but I didn't let go of her immediately and asked her why she followed me, but unexpectedly, she said that she also lived here, just across the door from me, and I didn't believe that she opened the door to show me.

Suspicious, I let go of my hand, and Shen Nuo jumped up from the ground, shaking my twisted arm while grumbling and pulling a key out of her pocket. After graduating from the police academy for so many years, I did not fall behind in the training of police physical skills, and at the police academy in City B, when I did not attend classes or study the case, I would go to the training ground to exercise.

Shen Nuo really opened the door, she pouted, and pointed to the room: "Now believe it, right?" ”

I looked into the room, it was very clean, there were a few suitcases on the ground, and as soon as the door was opened, there was a fragrance coming to my nose, which was the same as the perfume used by Shen Nuo. I glanced at Shen Nuo and asked her why she lived here.

Shen Nuo stuck out his tongue and smiled: "Only Professor Li can live here, so I can't live here?" ”

I don't know how Zhao Da asked his superiors, and the superiors would say that Shen Nuo went back to live in the old house. That house has been abandoned for so many years, and it can't be inhabited at all, as for the fire, I didn't ask much, after all, it was Shen Nuo's private matter. I don't doubt Shen Nuo's identity at all, the personnel file was directly transferred by the superior, the information and photos on it can't be fake, and Zhao Da has already called to confirm it.

I wasn't going to answer Shen Nuo anymore and wanted to open the door and go in, but Shen Nuo pulled me from behind, and she winked at me, "Professor Li, it's so late, do you want to go in and sit down?" ”

Looking at the ambiguous expression on Shen Nuo's face, I couldn't help but be stunned, and then, I had a feeling of disgust in my heart, and just when I was about to refuse coldly, Shen Nuo laughed out loud again.

"Professor Li, just kidding!" After Shen Nuo finished speaking, she jumped into her room, and before the door closed, she said to me with a grin: "But, Professor Li, you don't like women, right?" ”

"Bang", the door closed, I stood for a while, and finally opened the door and entered the room, I was also very helpless when I met someone with a character like Shen Nuo.

The hotel has internal and external compartments, my mother slept in one of them, took off her shoes, I quietly walked in, my mother was lying on the bed, the light was not turned off, she was already asleep, but she was holding a photo in her hand, it was my father's. I wanted to put the picture on the head of the bed, but my mother held on tightly.

I covered my mother's quilt, turned off the lights, and quietly withdrew.

After washing my face in a hurry, I lay down on the bed, I didn't get a good night's sleep for a few days, I was tired, but I couldn't sleep anymore, and my whole head echoed with the strange voice of the man on the phone.

I don't know when I fell asleep, but the next day, I was woken up by a sharp knock on the door......