Chapter 380 Blood Type Matching Results
Song Yiming said that based on the fact that the body parts had been fried, one might be able to infer the truth in reverse, thinking that the murderer cut the body parts into slices about one centimeter thick so that they could be quickly destroyed by high-temperature frying.
Simply put, the thicker the meat, the longer it takes to fry until cooked through.
The murderer may have done some testing and found that cutting into a thickness of about one centimeter, the cutting time + frying time is the fastest.
This may also explain why the thickest piece of flesh in the body was two centimeters thick.
Frying meat slices at high temperature will directly lead to three obvious results.
First, the police were unable to extract a DNA sample from the fried body.
This is very easy to understand. Not to mention that DNA technology was just starting out in the provincial capital in 1997, even if the technology matured twenty years later, it would be basically impossible to extract effective DNA from high-temperature treated body parts for testing and as evidence.
Second, the fried meat slices will have their actual weight much less than normal due to the high temperature causing the fat to melt and the water to be lost.
However, due to the lack of experimental and reference data, Song Yiming could not guarantee how many grams a pound of human flesh would weigh after being fried.
However, common poultry meats such as pork and beef will lose at least 40% to 50% of their weight after frying.
In other words, after frying, the weight of the body parts will be reduced and the volume will be reduced to a certain extent, which not only destroys the structure of the body but also makes it easier to dispose of the body.
At the same time, four fingers were found in the garbage bag, but the skin and human tissue at the fingerprint position had been cut off. It is likely that the fingerprints were directly burned.
Third, following up on the second point, after high-temperature frying, the volume of the meat slices shrinks and the surface structure deforms. This makes it virtually impossible to identify the cut surface and determine what type of tool the murderer used to dismember the body.
The third point responds to Ni Jianrong’s question that the murderer may be a medical worker.
In fact, from a forensic perspective, there is no basis for this inference. The murderer may be a doctor, or a chef, butcher, or slaughterhouse employee, or even none of them. He may simply be a person with extremely strong psychological quality and good physical strength.
Because dismembering a body like this is very physically demanding.
At this point, Zhou Yi raised his hand and asked a question: "Teacher Song, assuming the deceased was a typical female, 1.6 meters tall and weighing around 100 kilograms, how long would it take to complete this level of dismemberment and continue deep-frying at high temperatures? And how much oil would be consumed?"
Song Yiming shook his head and said, "I'm sorry, but I can't answer your question because I don't have any relevant case data to refer to. The best I can do is buy a hundred pounds of pork and run an experiment, but the experimental data will still have a large deviation."
Seeing Zhou Yi's serious look, Song Yiming asked, "Do you need me to buy some pork?"
Zhou Yi nodded and said, "I'll go buy the pork. I'll leave the experiment to Teacher Song."
Song Yiming also nodded seriously and said, "Okay."
Everyone thought that the two were joking about buying pork for an experiment, but they didn't expect that they were actually serious.
At this time, Xie Guoqiang said, "You don't need to buy pork. Just ask Mr. Li from the cafeteria to bring over 100 kilograms of pork. We'll cut it and fry it directly in the kitchen. You can use it to cook dishes after frying."
This is true, but everyone felt uncomfortable when they heard it.
Unexpectedly, Song Yiming shook his head and said, "Xie Director, we can't use the pork from the cafeteria. The pork they buy is cut into large pieces and doesn't include the internal organs. The data for the experiment will be incomplete. We have to buy a whole pig of about 100 kilograms, dismember it, cut it up, and fry it. That way, we can get a relatively complete result in terms of time and oil consumption."
Song Yiming's seriousness on this point surprised everyone. Xie Guoqiang looked at Zhou Yi and asked, "Zhou Yi, first, tell me, what is the purpose of having the forensic doctor conduct this experiment?"
Zhou Yi immediately stood up and said, "Thank you, Director. I want to calculate how long it would take for the murderer to kill, dismember, fry the body parts, and then dispose of the body. This time can help us reconstruct and analyze the murderer's entire crime process, and serve as reference data for subsequent investigations into the deceased's movements. Ideally, we can combine the location of the body disposal with the time it took the murderer to kill and dismember the body to outline the murderer's approximate range of movement. This may help us confirm the primary crime scene."
Xie Guoqiang asked doubtfully, "Is this feasible?"
It is definitely possible to deduce the murderer's route from the place where the body was dumped.
But combining the time of dismemberment to deduce the approximate scope of action, it doesn't sound inevitable.
Zhou Yi said weakly: "You'll know only if you try it."
In fact, there was a reason he didn't say for wanting to do this, which was that he used Lu Xiaoshuang's disappearance as a time node. He wanted to analyze whether the murderer could complete such a complicated crime in eight to nine hours.
Xie Guoqiang looked at Wu Yongcheng, then at Song Yiming and said, "You can discuss this among yourselves after the meeting. Xiao Song, does the forensic doctor have anything else to say?"
Song Yiming shook his head. "Not yet. We will provide formal autopsy reports in batches as soon as possible. We will then focus on the deceased's internal organs to find the cause of death."
What Song Yiming meant was that there was very little useful information on the body parts.
"Thank you for your hard work." Xie Guoqiang said, "Old Qiu from the technical department, please tell me."
The person named by Xie Guoqiang is Qiu Zhiyong, the head of the Technical Department. The Technical Department is responsible for on-site investigation of criminal cases, evidence extraction and testing, technical means analysis and other support work.
Qiu Zhiyong mainly provided the test and analysis results for the physical evidence that has been discovered so far.
The Technical Department only discusses objective facts and results and does not participate in any case analysis.
First was the gray travel bag containing the first bag of body parts. It was made of nylon and looked quite old, with severe signs of wear on the corners and some stitches coming undone.
However, there are no obvious features in appearance, and the style of the travel bag is relatively old-fashioned, unlike the popular styles nowadays.
Apart from the body parts, no other items were found in the travel bag, and no fingerprints or hair were found on the surface.
Next is the black garbage bag that was discovered later. There is nothing special about it. It is just an ordinary garbage bag that can be bought everywhere. It is probably difficult to find purchasing information.
Finally, there was the pink bow hairband that Chen Yan and his men found in the bag of body parts in the trash can at the Hongqi Road bus stop. A blood sample was extracted from it.
Qiu Zhiyong held up the information and said, "After testing, it was confirmed that the blood sample's blood type is A."
This result from the technical department made Zhou Yi's long-tensed nerves relax all at once, as if the invisible hand that had been strangling his throat had finally loosened a little.
Because before the meeting, Chen Yan told him the results obtained from the Blood Management Center.
Lu Xiaoshuang's blood type is B, which does not match the bloodstains on the hairband.
In other words, at least this blood was not left by Lu Xiaoshuang.
The best outcome is that Lu Xiaoshuang has nothing to do with this case, the hair circle is just the same product, and it is purely a coincidence.
But Zhou Yi knew that this was basically impossible. The fact that someone pretended to be him and cheated Lu Xiaoshuang away showed that there was a big problem.
So the blood on this hairband is either from the deceased or the murderer.
But there was one thing that made Zhou Yi feel very strange. So far, no clothes of the deceased had been found in the body bags. Why did such a hairband appear?
Was it an oversight by the murderer, or did he do it on purpose?
But no matter what, at least this information increased his confidence in the belief that Lu Xiaoshuang was still alive.
Xie Guoqiang turned to Wu Yongcheng and asked, "You called me this morning and said you had a strong suspicion about the identity of the deceased, a female university student from Hongda University. Has she matched the blood sample taken by the Technical Department?"
Wu Yongcheng replied, "We've done a blood match, but the blood types don't match. But based on the information we have so far, we can't rule out the possibility that the deceased wasn't Lu Xiaoshuang."
"Lu Xiaoshuang, yes, this name sounds familiar..." Xie Guoqiang pointed at Zhou Yi and said, "Is she the little girl Zhou Yi rescued at the food court that time?"
Most of the people present had no impression of Lu Xiaoshuang, except for the Third Team and Xu Nian.
Wu Yongcheng replied, "Yes, Director Xie. It's the little girl Zhou Yi saved. What we can confirm now is that Lu Xiaoshuang has been missing since she left Hongcheng University yesterday afternoon. No one knows her whereabouts. We have checked all the places she might have gone, but have not found her yet."
"Is he just missing? Then how is it related to this dismemberment case?"
"Thank you, Director. It's not just a disappearance. We can confirm that the pink hairband is exactly the same as the one Lu Xiaoshuang was wearing when she disappeared."
As soon as Wu Yongcheng finished speaking, the first person to react was Xu Nian. She immediately looked at Zhou Yi.
This was the first time she heard the information that this case was related to Lu Xiaoshuang, so like Qiao Jiali's previous reaction, she understood Zhou Yi's strange reaction on the train, but also wondered if Zhou Yi had any premonition in advance?
Xie Guoqiang fell silent for a moment, because with such a clear clue, the investigation of the case naturally could not avoid Hongda.
He was thinking about what to do.
After a moment, he had the answer.
"Well, after the meeting, come with me to my office. I'll call the relevant leaders at Hongda and ask them to cooperate with our investigation as much as possible. However, until there's clear evidence to confirm the deceased's identity, the investigation into Hongda should be kept low-key to avoid causing public opinion and panic both inside and outside the school."
"Understood. As long as the school is willing to cooperate, we can just have a small-scale, secret conversation and not escalate the situation."
Xie Guoqiang nodded and waved his hand, saying, "Anything else you've discovered? If so, keep talking."
Wu Yongcheng looked at Zhou Yi and raised his chin towards him.
Zhou Yi understood and said, "Thank you, Director. We have conducted a small-scale investigation into Lu Xiaoshuang's personal situation and found two suspicious individuals who may be related to Lu Xiaoshuang's disappearance."
"One is called Xu Liu, Lu Xiaoshuang's roommate, and the only person found so far who has a clear conflict with Lu Xiaoshuang."
Zhou Yi paused and said, "The other one is a lecturer from Hongda, named Xiao Bing."
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