Reborn in 97, I solved a cold case at the Municipal Bureau

Chapter 381 (Fourth Update, Seeking Votes) Blood Type Matching Results

Song Yiming said that the fact that the body parts were deep-fried suggests that the murderer cut the body parts into slices about one centimeter thick so that they could be quickly destroyed by deep-frying.

Simply put, the thicker the meat, the longer it takes to fry until fully cooked.

The murderer may have conducted tests and discovered that cutting the slices to a thickness of about one centimeter, combined with the frying time, resulted in the fastest cooking time.

This may also explain why the thickest pieces of flesh in the body were two centimeters thick.

Deep-frying meat slices at high temperatures will directly lead to three obvious results.

First, the police were unable to extract DNA samples from the deep-fried body.

This is very easy to understand. Let alone the fact that DNA technology in the provincial capital was just starting out in 1997, even if the technology matured 20 years later, it would still be virtually impossible to extract valid DNA from body parts that had been treated at high temperatures for testing and use as evidence.

Second, deep-fried meat slices will have a much lower actual weight than normal due to the high temperature causing the fat to melt and the moisture to be lost.

However, due to a lack of experimental and reference data, Song Yiming could not guarantee how many grams a pound of human flesh would weigh after being deep-fried.

However, considering common poultry meats such as pork and beef, frying will result in a loss of at least 40% to 50% of their weight.

In other words, frying reduces the weight and volume of the body parts, which not only damages the structure of the body but also makes it easier to dispose of it.

Meanwhile, four fingers were also found in the garbage bag, but the skin and human tissue at the fingerprint location had been cut off, and it is highly likely that the fingerprints were burned directly.

Thirdly, following the second point, the volume of the meat slices shrinks after being deep-fried at high temperatures, and the surface structure also deforms. This makes it virtually impossible to examine the cut surfaces to determine what type of tool the murderer used to dismember the body.

The third point addresses Ni Jianrong's question: the murderer may be a medical worker.

From a forensic perspective, there is no basis for this conclusion. The murderer could be a doctor, a chef, a butcher, or a slaughterhouse employee, or even none of these. He could simply be someone with exceptional mental fortitude and physical strength.

Dismembering a body like that is extremely physically demanding.

At this moment, Zhou Yi raised his hand and asked a question: "Professor Song, assuming the deceased was a woman who was 1.6 meters tall and weighed about 100 kilograms, with a fairly standard female figure, 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, I can't answer your question because there is no relevant case data for reference. At most, I can buy 100 jin of pork and conduct an experiment, but the experimental data will still have a large deviation."

Seeing Zhou Yi's serious expression, Song Yiming asked, "Do you need me to buy pork?"

Zhou Yi nodded: "I'll go buy the pork. I'll leave the experiment to Professor Song."

Song Yiming nodded earnestly and said, "Okay."

Everyone thought the two were joking about buying pork for the experiment, but it turned out they were both serious.

At this moment, Xie Guoqiang spoke up: "We don't need to buy pork. Just have Old Li from the canteen bring over 100 jin of pork. We can cut and fry it directly in the kitchen, and then use it to cook other dishes."

That's true, but everyone who heard it felt quite uncomfortable.

Unexpectedly, Song Yiming shook his head and said, "Director Xie, we can't use the canteen's pork. The pork we buy from the canteen is cut into large pieces and doesn't include the internal organs, so the experimental data won't be complete. We need to buy a whole pig weighing about 100 jin (50 kg), dismember it, cut it up, and fry it to get a relatively complete time and oil consumption figure."

Song Yiming's seriousness on this point surprised everyone. Xie Guoqiang looked at Zhou Yi and asked, "Zhou Yi, tell us first, what is the purpose of having the forensic doctor conduct this experiment?"

Zhou Yi immediately stood up and said, "Director Xie, it's like this, I want to calculate how long it would take for the murderer to commit the entire crime—murder, dismemberment, frying the body parts, and disposing of the body. This timeframe can help reconstruct and analyze the entire crime process and serve as reference data in subsequent investigations of the victim's movements. Ideally, by combining the location where the body was disposed of with the time required for the murderer to kill and dismember the body, we can define a rough area of ​​the murderer's movements. This might be helpful in confirming the primary crime scene."

Xie Guoqiang asked with some skepticism, "Is this feasible?"

It is certainly possible to deduce the killer's route from the location where the body was dumped.

However, considering the time it took to dismember the body and extrapolate the approximate range of movement, it doesn't seem to make any sense.

Zhou Yi said weakly, "We'll only know if we try."

Actually, there was one reason he didn't mention: he used Lu Xiaoshuang's disappearance as a time point to analyze whether the murderer could have completed such a complex crime within eight to nine hours.

Xie Guoqiang looked at Wu Yongcheng, then at Song Yiming, and said, "You two can discuss this yourselves after the meeting. Song, is there anything else the forensic doctor has to say?"

Song Yiming shook his head: "No more for now. We will provide formal autopsy reports in batches as soon as possible. We will focus on autopsies of the deceased's internal organs to find the cause of death."

The implication of Song Yiming's words was that there was very little useful information left on the body parts.

"Thank you for your hard work," Xie Guoqiang said. "Old Qiu from the technical department, tell us what you've got to say."

The person named by Xie Guoqiang was Qiu Zhiyong, the head of the Technical Section. The Technical Section is responsible for supporting work in criminal cases, including crime scene investigation, evidence collection and testing, and technical analysis. Qiu Zhiyong primarily provided testing and analysis results for the physical evidence that has already been discovered.

The technical department only presents objective facts and results, and does not participate in any case analysis.

First, there was the gray travel bag containing the first bag of body parts. It was made of nylon and looked quite old, with severe wear and tear on the edges and corners, and some of the stitches had come undone.

However, it doesn't have any obvious features in appearance, and the style of the travel bag is rather outdated, 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, the black garbage bags were discovered. They were nothing special; they were just ordinary garbage bags that could be bought anywhere, and it would probably be difficult to find information on how to purchase them.

Finally, there was the pink bow hair tie that Chen Yan and his team found in the trash can at the Hongqi Road bus stop, inside the bag of body parts. They were able to extract a blood sample from it.

Holding the documents, Qiu Zhiyong said, "After testing, the blood type of the blood sample has been confirmed to be type A."

The technical department's result immediately relieved Zhou Yi's long-standing tension, as if the invisible hand that had been gripping his throat had finally loosened its grip a little.

Before the meeting, Chen Yan had told him the results obtained from the blood management center.

Lu Xiaoshuang's blood type is B, which does not match the bloodstains on her hair tie.

In other words, at least this blood was not left by Lu Xiaoshuang.

The best outcome would be that Lu Xiaoshuang is unrelated to this case, and the hair ties are just the same product, a pure coincidence.

But Zhou Yi knew that this was basically impossible. The fact that someone impersonated him and tricked Lu Xiaoshuang indicated that there was a big problem.

Therefore, the blood on this hair tie either belongs to the deceased or to the murderer.

But something puzzled Zhou Yi: no clothing of the deceased had been found in the body bags so far, so why was there a hair tie?
Was it an oversight by the murderer, or did they do it intentionally?
But regardless, this information at least strengthened his belief that Lu Xiaoshuang was still alive.

Xie Guoqiang turned to Wu Yongcheng and asked, "You called me this morning and said you have a strong suspicion about the identity of the deceased, a female college student from Hongda University, and that the blood sample taken by the technical department has been matched?"

Wu Yongcheng replied, "The blood types have been matched, but they don't match. However, based on the information we have so far, we cannot rule out the possibility that the deceased was not Lu Xiaoshuang."

“Lu Xiaoshuang, yes, that name sounds familiar…” Xie Guoqiang pointed at Zhou Yi and said, “Isn’t she the little girl Zhou Yi rescued in the food street that time?”

Most of the people present had no impression of Lu Xiaoshuang, except for the Third Brigade and Xu Nian.

Wu Yongcheng replied, "Yes, Director Xie, that's the little girl Zhou Yi saved back then. What we can confirm now is that Lu Xiaoshuang has been missing since she left Hongcheng University yesterday at noon. Nobody knows where she is. We've checked the places she might have gone, but we haven't found her yet."

"Just missing? What's the connection between that and the dismemberment case?"

"Director Xie, it's not just a simple disappearance. We can confirm that the pink hair tie 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, who immediately looked at Zhou Yi.

This was the first time she had heard about the case and Lu Xiaoshuang's connection to it, so just like Qiao Jiali's previous reaction, she understood Zhou Yi's strange reaction on the train, but wondered if Zhou Yi had some kind of premonition.

Xie Guoqiang fell silent for a moment, because with such a clear clue, the investigation of the case would naturally have to go around Hong Da.

He was thinking about what to do.

A moment later, he had his answer.

"Okay, after this meeting, come to my office with me. I'll call the relevant leaders at Hongda and ask them to cooperate with our investigation as much as possible. But before we have clear evidence to confirm the identity of the deceased, we can't launch a big investigation into Hongda to avoid causing public opinion and panic inside and outside the school."

"Understood. As long as the school is willing to cooperate, we will only have small-scale, secret talks and will not escalate the situation."

Xie Guoqiang nodded and waved his hand, saying, "Any other discoveries? If so, please continue."

Wu Yongcheng looked at Zhou Yi and gestured with his chin.

Zhou Yi understood and said, "Director Xie, we have conducted a small-scale investigation into Lu Xiaoshuang's personal situation and found two people who are quite suspicious and may be related to Lu Xiaoshuang's disappearance."

"One of them is Xu Liu, who is Lu Xiaoshuang's roommate and the only person we've found to have a clear conflict with Lu Xiaoshuang."

Zhou Yi paused for a moment and then said, "The other one is a lecturer from Hongda, named Xiao Bing."

　tomorrow!
　　
　
(End of this chapter)