Chapter 296

Captain Ma went out to investigate, and the few people left in the small bathroom also calmed down a bit, each lowering their heads to do their own work.

Jiang Yuan also lowered his head to think.

For him, the preceding part of the case had basically been completed. The judgment of the deceased's time of death did indeed have differences, but this was not a problem; perhaps, it could be used to solve the case.

Of course, based on Jiang Yuan's experience, even without using this skill, for this level of case, as Captain Ma returns from the investigation, there might be other clues to solve it.

Jiang Yuan was thinking to reset his thoughts.

Comrade Ye Tianhe was a little noisy.

As a fellow forensic doctor, Jiang Yuan could now understand that Ye Tianhe was actually just outputting too much directly and was a little unaccustomed to being questioned.

The status of a forensic doctor at a crime scene is actually relatively high, referring to the status in terms of professionalism.

Usually, after a forensic doctor gives an inference of the time of death at the scene, there will be no criminal police questioning: Did you calculate it wrong?

Even criminal investigation captains do not have the relevant professional ability and confidence to make such a judgment. At most, they just bully newly arrived forensic doctors.

Outsiders look at forensic doctors; as long as the forensic doctor is unmoved in the face of the body and unmoved in the face of the stench, it is about enough, at most asking about topics of love and family life.

Professional exchanges between forensic doctors are often not too intense.

Especially grassroots forensic doctors; either they get the support of forensic doctors from higher-level units, recognizing your professionalism, then you have the final say.

Or, the grassroots forensic doctor's own professionalism is not high, their self-confidence is not strong, and they will not enter into intense arguments.

Ye Tianhe actually belongs to a relatively strong forensic doctor.

As a forensic doctor of the Criminal Investigation Detachment of a provincial capital city, although Ye Tianhe looks easy to talk to, he will not fully recognize even the technical guidance of the provincial department's forensic doctors.

Therefore, most of the time, Ye Tianhe is actually outputting in one direction, and there is rarely verification.

In normal cases, after Ye Tianhe arrives at the scene as a forensic doctor, checks the body, and reaches a conclusion, the criminal police will not question him. Even if their peers are confident enough, in terms of strength, they will not exceed Ye Tianhe too much, and the methods used should be about the same, and the answers obtained should be like this.

As for the truth of the case, it will neither get immediate feedback nor necessarily get accurate feedback. Finally, even if the conclusion reached is that the forensic doctor has omissions, differing by a few hours, or even a few days, forensic doctors can actually easily comfort themselves.

In fact, just using rectal temperature or liver temperature for death time identification, the accuracy of most regression equations at the time of design is only about 85% or 90%, and an error of an hour or two is a common occurrence.

Therefore, rather than saying that Jiang Yuan and Ye Tianhe have a conflict of opinion, it is better to say that the standards of the two are not at the same level.

Ye Tianhe just hasn't encountered such a direct face-to-face challenge for a few days.

After calming down, Ye Tianhe quickly figured it out himself and took the initiative to smile at Jiang Yuan: "Jiang Yuan, was I led into a loop by you just now? I was talking to you about body temperature, judging the body's time of death through rectal temperature, and you were hanging rigor mortis, cornea, and everything else on it." Jiang Yuan saw this and also eased the atmosphere: "I was in a hurry to come over, in a rush. It is true that the time of death made by other elements and the time of death made by body temperature are not quite the same, so the factor of body temperature seems a bit abrupt." Ye Tianhe just nodded, with a general degree of understanding.

After all, forensic doctors who do death time identification definitely use body temperature if they can.

Because body temperature is easier to quantify. Whether it is rectal temperature, liver temperature, or body surface temperature, etc., when the thermometer is put on, it will give an accurate temperature.

The accurate temperature, substituted into the regression equation, even if it is a simplified regression equation, the accuracy of the conclusion of the time of death is actually very high.

And for the criminal police who use this data, whether it is the criminal police of the Changyang Municipal Criminal Investigation Detachment or the criminal police of the Ningtai County Criminal Investigation Detachment,

when the body of the day is accurate to within two or three hours, and the body within a few days is accurate to morning, noon, and evening, they are very satisfied.

The time Jiang Yuan gave was too accurate, which is actually unconventional.

It is normal for Ye Tianhe not to understand.

Jiang Yuan didn't have time to give him a lecture, only saying: "Actually, if there are conditions, doing a chemical analysis of the eyeball should also be able to reach a relatively accurate conclusion. Because of the rupture of red blood cells, the aggregation of potassium ions is basically unaffected by temperature." Ye Tianhe said: "Perhaps, mainly because the time difference is relatively large." "I agree." Jiang Yuan said: "Normal weather, normal environment, the time difference is so large, it is also unconventional."

"En."

"I think this is very likely because the suspect faked the scene."

Ye Tianhe was stunned, his eyes first fell on the bathtub next to the bathroom, and he asked: "How was it faked?"

With his forensic experience, the first thing he thought of was through the bathtub.

Water bath has a very large influence on temperature, several times larger than air. Therefore, the identification of the time of death of a body in water is very different from the identification of a body on land.

If ice or heat is added to the water, this difference can indeed be very large.

Ye Tianhe stepped forward again to check the body, then shook his head and said: "There is no sign of touching water either."

"Actually, you can calculate backward, using that multiple regression equation."

Jiang Yuan took out the notebook he carried with him, and while writing, said: "Assuming rectal temperature is y, ambient temperature, clothing or coverings, the carrier of the body, the ventilation situation of the environment, humidity, gender, age, body type, cause of death, are respectively adefgh, if coefficients are given, the equation is, y=44.352-0.311a+0.188b+0.035c+0.136d+0.563e+0.664f+0.049g+0.019hm

Ye Tianhe was a bit concerned just now that Jiang Yuan didn't measure rectal temperature, didn't give data, and opened his mouth to say a number.

Now, listening to the data Jiang Yuan gave, he fell into confusion again.

While Jiang Yuan substituted the numbers for calculation, he continued to introduce: "The most important thing here is to quantify adefgh. For example, the cause of death can be simply quantified according to the amount of bleeding. If heavy bleeding can be given 2, then the husband has an alibi." "What kind of evidence?" Jiang Yuan still had to ask. Alibis, theoretically, also have cases of being faked, especially those who like to engage in perfect murders; there is too much empty-to-empty discussion, and it is hard to guarantee that someone will not discuss it.

Captain Ma shook his head and said: "The evidence is very solid. This husband works in an outsourced internet company. There are cameras at the workstation, cameras for clock-in records, cameras for entering and leaving the office building, and mobile phone warnings if you leave your seat for a long time. Unless the company fakes it on a large scale, it is impossible."

"Then there is someone else." Jiang Yuan nodded.

Captain Ma hesitated and whispered: "Maybe don't be so tight on the time of death" "I have verified it, there is no big problem with the time of death." Jiang Yuan shook his head.

"Verified?" Captain Ma asked one more question.

Jiang Yuan tore off the verification page from the notebook and handed it to Captain Ma.

Captain Ma saw the massive amount of letters and numbers, and then revealed a pure human smile: "I asked for nothing."

"This multiple regression equation is not easy to calculate backward, but someone must have faked the crime scene and interfered to make the body temperature disordered." Jiang Yuan did the calculation just to clarify his thoughts.

Now that his thoughts were clear, he didn't need to look at those numbers, and said to himself: "Either the deceased was drugged, this needs to be toxicology tested, or someone made changes to the body or the environment around the body. The bathroom of this family is not big. If the temperature and humidity are increased for two or three hours, if it is increased high enough, it is still possible. However"

Jiang Yuan looked at Wu Wu Fa Yi Ye and Captain Ma and said: "If it is high temperature and high humidity, you should be able to feel it when you come in."

Ye Tianhe shook his head slightly: "I walked for 40 minutes on the way.

The police officer who received the report didn't say anything either. Captain Ma, ask?"

Captain Ma said "En" and immediately took out his mobile phone to ask.

Soon, Captain Ma put down his mobile phone and shook his head: "The two people who received the report didn't feel it."

"Then... ask the husband?" Jiang Yuan hesitated a little.

Captain Ma frowned slightly: "This... if it's not very certain, I think we can put it aside for a bit? Um... assuming someone really faked the scene and created high temperature and high humidity, but now there is no high temperature and high humidity, it shows that he finally eliminated the high temperature and high humidity in advance. Could it be an old thief? Sneak in in advance, commit the crime, and leave."

He was purely cooperating with Jiang Yuan. From Captain Ma's point of view, such a complex case actually rarely happens. The more of an old thief, the less likely they are to make the case like this.

"If he came in, there might be traces left." Jiang Yuan simply stood up and said: "I'll help brush the scene, Wu Wu Fa Yi Ye, will you take the body back for autopsy?"

"Okay."

Several people didn't talk nonsense anymore and returned to the bathroom to operate.

Jiang Yuan changed his clothes, changed his gloves, put on special glasses, and began to try to investigate the scene starting from the bathroom.

Everything seemed to enter the regular track.

Just like before.

Captain Ma and Wan Baoming sighed in unison, then looked at each other and smiled.

Just when the two felt relaxed, Jiang Yuan's voice came again: "This family seems to be using smart home appliances. The bathroom air conditioning, bath heater, and ventilation can all be operated remotely."

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