Mobei City Public Security Bureau, Criminal Investigation Detachment.
In the office, Wen Sibao was looking at a forensic team's identification report on the deceased in a recent case. An unusually eye-catching conclusion in the report attracted his attention.
——Based on the stiffness of the body at the crime scene, the degree of corneal turbidity and the spread of the body spots, the time of death was approximately 6-8 hours before the crime scene was discovered.
A young female forensic doctor asked: "Senior, during the time when the deceased died, the suspect had sufficient alibi. Could we really have arrested the wrong person?"
Wen Sibao sat upright, staring at the photos of the deceased with piercing eyes and said: "Impossible, we will never arrest the wrong person! I can see at a glance that the suspect is not telling the truth. Regarding the time of death and the
There must be some mistake in his alibi!"
This female forensic doctor is Wen Sibao's junior schoolmate two years ago when she was in the police academy. Her full name is Li Mengxue. From the day she entered the police academy, she has had a vague feeling of admiration for the senior in front of her. At this time, after hearing this
After saying this, she couldn't help but have doubts about Wen Sibao's judgment, but doubts were doubts, and she still firmly believed in the other party's judgment. This was an inexplicable sense of trust.
Another young boy who had just graduated sitting next to Li Mengxue was unhappy and muttered: "This appraisal report was made by Master Mengxue himself. The master said that when the deceased was found, he was not only consistent with rigor mortis but also generalized rigor mortis."
The spots have not reached the maximum level of scarring, and the cornea has not reached the level of turbidity. How could it be wrong..."
"Shut up!" Li Mengxue scolded his apprentice in a low voice. "Xu Wudi! Don't talk!"
Xu Wudi is a newcomer who joined the forensic team this year and is also Li Mengxue's apprentice. His life ambition was to be a dentist with a vise in hand, because in his simple mind, there is only one or a pair of any organ in the human body.
But there are 32 teeth, and the number of wisdom teeth can reach 36. Therefore, based on the principle of quantity over everything, Xu Wudi believed that dentistry will be the most profitable industry in human society in the future, so he resolutely applied for the city's medical university after the college entrance examination.
majored in stomatology, but he never thought that when he was filling in his application form, he suddenly saw an option called "obey adjustment." At that time, he didn't understand what "adjustment" meant at all, and he only understood the two words "obey" on the application form.
Words. His grades were not very satisfactory and he was afraid that he would not be able to enter the Medical University, so he did not ask so many questions and resolutely checked "obey" to show his firm belief that he wanted to become a dentist.
So after the results were announced, Xu Wudi was inexplicably assigned to the forensic science major, where admission scores are reduced every year.
After joining the work, Xu Wudi, a young man who had just graduated, had a character as his name suggests. He thought he was invincible and was extremely reckless. Once, he almost had a myocardial infarction when he was so angry at the political commissar of the Public Security Bureau who was in charge of ideological and political work at a meeting.
Later, Xu Wudi "became famous in one battle" internally, and legitimately had the title of "Invincible".
Although Wudi is "invincible", he only listens to Li Mengxue in the entire team. At this time, he was reprimanded by his master and he did not dare to talk anymore, but in his heart he was still unconvinced by Wen Sibao's judgment and thought that Wen Sibao did not believe him.
The master judged, muttering something grumbling under his breath.
Wen Sibao put down the photo and said to Li Mengxue: "The suspect this time is very cunning. From the beginning, I have been thinking about what I should do to have an alibi if I am the murderer."
Li Mengxue said: "What the senior means is..."
Wen Sibao looked directly at the other party and said: "I not only believe in your identification results, but also believe in your judgment. But because of this, I think the suspect used some kind of means, which caused your forensic team to identify the death
There is a deviation in the time.”
Suddenly, Wen Sibao's breathing became rapid, his eyes seemed to be on fire as he stared at the photo in front of him, and said loudly: "I seem to have discovered something! You two, come over and see what this is?"
Wen Sibao pointed to the photo of the crime scene and said, "Look at the pool of blood under the body."
In the photo, the blood under the deceased has long dried up and seeped into the ground. However, judging from the traces on the ground, this large pool of blood has an irregular shape, and even the edges of the pool of blood have been pulled out with several slender strips.
bloodstains.
Xu Wudi took a look at the photo and answered directly without thinking: "What's wrong with this pool of blood? With so much blood shed here, it must be the scene of the first crime!"
"You are right, this is the scene of the first crime." Wen Sibao continued to ask the two of them: "Then do you remember the weather conditions on the day of the crime scene?"
Li Mengxue said: "Well, I remember it was the afternoon when the body was found that day. The weather was muggy and hot. The air conditioner in the van of our forensic team broke down. Wuwei was scolded by the team leader for complaining that it was too hot in the van."
Wen Sibao nodded and continued to explain: "Then this is very strange. Since there has been no wind all day and the weather is extremely hot, why does the blood flowing under the corpse show such traces?"
Hearing this, Li Mengxue immediately understood, and hurriedly checked the photo again, and said in surprise: "Ah! I understand, senior, you are right! If it were not for windy weather, the naturally shed blood would become a marginal whole
A pool of blood gradually spreads outward, and it is impossible to have such traces now! Only in strong winds, the blood flowing on the ground will turn into irregular traces, which is the state of the blood around the deceased now.
Commonly known as 'rake shape'."
Wen Sibao nodded affirmatively and said: "So the problem did arise here. I just checked the weather forecast for that period. There was only a sandstorm the day before the incident. The wind force at that time even reached level 6.
The weather was sunny and windless the rest of the time, so based on this judgment, I think the real time of death of the deceased was about 24 hours before the incident, which was when there was a strong wind the day before."
"but……"
Although according to the photo, the "rake-like" blood traces around the body are enough to indicate the weather conditions at that time, Li Mengxue still asked doubtfully: "If the time of death really exceeded 24 hours, what about the spots on the body, the degree of stiffness, and the degree of decay?"
The chemical reaction with the cadaver's internal organs should never have been what we were testing for."
"You're right! But this is where the murderer confuses us! It's also where the murderer is most daring!" Wen Sibao took out another photo of the deceased on the autopsy table. In the photo, the deltoid muscles on both sides of the deceased's arms were
There are two dark red marks less than 1cm each between the large pectoral muscles. He explained: "I have been thinking about this issue from the beginning. No matter how you look at it, these two red marks look like two creases, and
The skin at the crease also has scars caused by external force tearing, and the same scars also appeared on the inner thighs and calves.”
Li Mengxue said in confusion: "Creases? Do you suspect that these are the creases left by the deceased's curled up body? No way? Such creases can only be caused by external force and the curled up movement for a long time, but it is impossible to cause the current
This kind of skin tearing."
"That's the problem!" Wen Sibao said: "I have a bold guess. The murderer killed someone a day ago. After returning home, he became more and more frightened after thinking about it, so he returned to the scene of the crime, took the body away, and stored it in a
After the body in the sack was completely frozen for more than ten hours, the murderer entrusted an accomplice to bring the body back to the scene of the crime, and then waited for the body to thaw. However, the accomplice probably did not have a strong psychological quality, so
Before the corpse was completely thawed, external force was used to forcibly unfold the crouched corpse. At this time, the surface of the corpse's skin still had the stickiness caused by freezing, so there were spots on both sides of the shoulder sockets and on the inside of the thighs and calves.
It left scars of skin tearing."
Wen Sibao paused and continued to explain: "The murderer's accomplices need to wait for about 2-3 hours of natural thawing time to do the above series of things. Therefore, the forensic team's identification of the body's time of death will certainly be biased, and the murderer is
He used the time when the body was thawing to create his own alibi. It has to be said that by doing this, the murderer not only returned the body to the scene of the first crime, but also made a solid alibi for himself.
, and at the same time confused our forensic team's misjudgment of the time of death, which can be said to kill three birds with one stone! But there is one flaw in the secret, that is, the murderer never expected that there would be continuous exposure to the weather after the murderer died, thus leaving us with
The most important clue is blood traces!”
As soon as he finished speaking, the fax machine on Wen Sibao's desk buzzed. After a while, a test report from the provincial forensic team was faxed over. After taking a look, his face suddenly showed
He gave a confident smile and then handed the fax report to Li Mengxue.
Li Mengxue took the examination form from the provincial department's forensic team and found that it read, "According to the examination of the corpse samples sent by the forensic team of the Mobei Criminal Investigation Detachment, there were multiple rupture injuries to the cells in the samples. Therefore, the conclusion is as follows: The corpse had been damaged after death."
After freezing."
Li Mengxue asked in surprise: "This...isn't this the provincial forensic team's inspection report? Senior, when did you send the corpse samples?"
Wen Sibao said: "In fact, after seeing the identification results of your forensic team, I suspected that the murderer might have used some method to tamper with the body, so I took it upon myself to send a sample to the provincial department.
The test did not surprise me as I expected. The murderer used the freezing method, which caused the deviation in the time of death that you tested. However, this method has a drawback, that is, the volume of ice cubes will be larger than that of water, so
Ruptive damage can only be detected by the cells in the body of a corpse."
Xu Wudi, who had been silent all this time, finally couldn't sit still anymore and muttered in a low voice: "You... still don't believe Master Meng Xue after all!"
On the other hand, Li Mengxue showed no dissatisfaction with Wen Sibao at all. Instead, she looked at him with an expression of admiration.
Wen Sibao paused and continued his analysis: "Since the suspect had a direct financial dispute with the deceased, our police will soon suspect him, so the suspect needs to entrust a person who has nothing to do with the deceased.
The third person, his accomplice, brought the body back to the scene of the crime. The reason why the murderer did not dispose of the body was because during this period, no matter whether he went out of the city or went to any public place, the trunk was guarded by security guards.
The first place to check is that instead of taking the risk of dumping the body in a corner, he should make a solid alibi to completely get rid of his own suspicion, so that no matter how the police investigate, they will not find him.
"
Wen Sibao stood up and explained emotionally: "Now we know that the corpse has been frozen, and the cold storage in Mobei City is concentrated in the South District, so we need to check two things now. One: Meng Xue, you are responsible
Then check the surface of the body's skin to see if there are still flax fibers in the sack. Second: I am responsible for checking the vehicles in the surveillance video 2-3 hours before the crime, and then compare them with the vehicles that appeared in the cameras around the crime scene.
, as long as there is a consistent vehicle, there is a high probability that it is the vehicle used by the murderer’s accomplices!”
Looking at Wen Sibao's confident expression, Li Mengxue seemed to have a little rabbit beating in his heart. After a while, he unconsciously said to him: "Senior, you..."
Before Li Mengxue could say anything, she heard the office door suddenly being pushed open, and Murong Shui's unobtrusive greeting came.
"Hello! Baby Wen! Sister Meng Xue! My aunt is here to see you!"
Hearing Murong Shui's greeting, several people looked back and spotted Xu Tiannan beside Murong Shui. Everyone's faces suddenly had expressions that were hard to explain.
The last time Xu Tiannan met these people was when he was invited to assist the Criminal Investigation Detachment in solving the April 15 serial theft case. Although he was assisting in handling the case, the first thing he did when he came was to help the only one.
The suspects were cleared of charges.
The case was very simple. The trace investigation team collected an extremely clear bloody fingerprint at the crime scene. They also found a fainted man in a vegetable cellar two hundred meters away from the crime scene. After investigation, the man
He turned out to be a burglar with three previous criminal convictions. After comparison, this person's fingerprints perfectly matched those in the bloody fingerprints left at the crime scene, so he was quickly convicted.
But the bizarre part of this case is that the suspect always insisted that he was knocked unconscious and thrown into the vegetable cellar that night, and refused to admit to the crime of wounding and theft.
Xu Tiannan's method for clearing this person's suspicion was also very simple. He asked the leader of the criminal investigation detachment to apply red ink on his hands, and then asked the other party to press his palm against a white wall in full view of the public. Waiting for the leader's palm prints
After printing on the white wall, something unexpected happened. Among the clear palm prints on the white wall, only half a fingerprint was left on the thumb. Later, the leader changed the wall.
Next, I printed my palmprint again, but I was surprised to find that this time the experiment was the same as before, with only half a fingerprint left on the thumb.
Through this experiment, the problem has surfaced, that is, the fingerprints found by the trace investigation team at the crime scene were complete and clear fingerprints of five fingers.
Xu Tiannan explained this as follows: In view of the physiological structure of the human palm, when the entire hand is completely covered on the wall, only half a thumb's fingerprint will be left. Therefore, the trace investigation team found at the crime scene
There is only one possibility for that fingerprint with clear five-finger fingerprints, and that is that the suspect was unconscious after being knocked unconscious, and the real murderer pressed his five fingers on the wall one by one.
Later, Xu Tiannan finally helped the police crack the theft case and find the real culprit behind it by analyzing the behavioral patterns of the gang of criminal suspects. However, although the case was solved, the leader of the criminal investigation detachment was severely punished for arresting the wrong suspect.
Because of the friction on the ground, he took Wen Sibao to the office alone for a briefing and ordered Wen Sibao to never allow such an incident to happen again in the future.
But after all, the leader said that if he actually encountered a case, he would still have to ask Xu Tiannan, an expert in criminal investigation, for assistance. Moreover, Wen Sibao knew that he would inevitably be caught in the middle in the future, and in the end the two sides would be different.