civil forensic

Chapter 306 Regression Equation
Captain Ma went out to investigate, and the few people who stayed in the small bathroom also calmed down for a while, and each lowered their heads to do their work.

Jiang Yuan also lowered his head to think.

For him, the preamble to the case has basically been completed.There are indeed differences in the judgment of the time of death of the deceased, but this is not a problem, maybe it can be used to solve the case.

Of course, with Jiang Yuan's experience, even if this skill is not used, there may be other clues to solve a case of this level after Captain Ma's investigation returns.

Jiang Yuan thinks in order to reset his mind.

Comrade Ye Tianhe was a little noisy.

As a forensic doctor, Jiang Yuan can now understand that Ye Tianhe actually output too much directly, and he is not used to being questioned.

The status of the forensic doctor at the crime scene is actually relatively high, which refers to the professional status.

Generally speaking, after a forensic doctor gives an inference on the time of death at the scene, no criminal police will ask: Did you make a mistake?
Even the captains of the criminal police do not have the relevant professional ability and confidence to make such a judgment.The most they can do is bully the new forensic doctor.

When a layman sees a doctor, it is almost enough to see a doctor who remains still in front of a dead body and a stench, and at most asks questions about love and family life.

Professional exchanges between forensic doctors and forensic doctors are often not too intense.

Especially for grass-roots forensic doctors, if you get the support of forensic doctors from higher-level units and recognize your profession, then you have the final say.

Or, grass-roots forensic doctors themselves are not highly professional, nor do they have strong self-confidence, and they will not get involved in fierce debates.

Ye Tianhe is actually a relatively strong forensic doctor.

As the forensic doctor of the criminal police detachment of the provincial capital city, although Ye Tianhe looked easy to talk to, he would not fully approve of the technical guidance of the provincial department's forensic doctor.

Therefore, most of the time, Ye Tianhe is actually a one-way output, and there is little verification.

In a normal case, Ye Tianhe arrives at the scene as a forensic doctor. After examining the body and drawing a conclusion, the criminal police will not question him. Even if his colleagues are confident enough, in terms of strength, they will not surpass Ye Tianhe by much. The methods and methods used should be similar, and so should the answers.

As for the truth of the case, we will not get immediate feedback, nor will we necessarily get accurate feedback. In the end, even if the conclusion is that the forensic doctors have made omissions, and the difference is a few hours or even a few days, the forensic doctors are actually easy to relieve my own.

In fact, the accuracy of most of the regression equations at the beginning of the design is only 85% or 90% when the rectal temperature or liver temperature is used to identify the time of death, and the error is one or two hours. It is commonplace.

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

Ye Tianhe has only been in a while, and has not encountered such a direct face-to-face challenge.

After calming down, Ye Tianhe figured it out quickly, and took the initiative to smile with Jiang Yuan: "Jiang Yuan, did I get caught in by you just now? I'll talk to you about the body's temperature, and judge the body's anal temperature. At the time of your death, you are rigor, and your cornea is hanging up."

Seeing this, Jiang Yuan eased the atmosphere and said: "I came here in a hurry, in a hurry. It is true that other elements, the time of death made, and the time of death made by the corpse temperature are not the same, so , the factor of body temperature seems a bit abrupt."

Ye Tianhe just nodded, with a mediocre level of understanding.

After all, when forensic doctors do the identification of the time of death, those who can use the body temperature must use the body temperature.

Because corpse temperature is easier to quantify.Whether it is rectal temperature, liver temperature, or body surface temperature, etc., when the thermometer is placed on it, an accurate temperature will be given.

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

For the criminal police who use this data, whether it is the criminal police of the Changyang City Criminal Police Detachment or the criminal police of the Ningtai County Criminal Police Brigade, the corpses of the day are accurate to within two or three hours, and the corpses within a few days are accurate to the morning and noon. Evening is enough.

The time given by Jiang Yuan is too accurate, in fact, it is unconventional.

It is normal for Ye Tianhe not to understand.

Jiang Yuan didn't have time to give him a class, so he said: "Actually, if conditions permit, a relatively accurate conclusion should be drawn by doing a chemical analysis of eyeballs. Because of the rupture of red blood cells, the accumulation of potassium ions is basically not affected by temperature. affected."

Ye Tianhe said: "Perhaps, the main reason is that the time difference is relatively large."

"I agree." Jiang Yuan said: "Normal weather, normal environment, such a big time difference, it is also unconventional."

"kindness."

"I think this is probably because the suspect forged the scene."

Ye Tianhe was taken aback, his eyes first fell on the bathtub next to the bathroom, and he asked, "How did you fake it?"

Based on his forensic experience, the first thing he thought of was actually going through the bathtub.

The influence of the water bath on the temperature is very large, several times greater than that of air.Therefore, the identification of the death time of corpses in water is very different from the identification of corpses on land.

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

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

"Actually, you can do the calculation backwards, using that multiple regression equation." Jiang Yuan took out his notebook and said while writing: "Assume that the rectal temperature is Y, the ambient temperature, clothing or coverings, the carrier of the corpse, and the ventilation of the environment , humidity, gender, age, body shape, and cause of death are ABCDEFGH respectively. If the coefficient is given, the equation is, Y=44.352.311A+0.188B+0.035C+0.136D+0E+563F+0.664G+0.049H ..."

Ye Tianhe was a little concerned just now, Jiang Yuan accidentally measured his rectal temperature, and without giving the data, he just opened his mouth and said a number.

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

Jiang Yuan continued to introduce while substituting the numbers, "The most important thing here is to quantify ABCDEFGH. For example, the cause of death can be simply quantified according to the amount of bleeding. Major bleeding can be given -2, and internal bleeding can be given -1. 0, craniocerebral injury is 1, poisoning is 1, and in case of poisoning or medication, you can give 1 here, well, hypnotic and sedative drugs are excluded, and the mechanical asphyxia we encountered this time is 2. "

Ye Tianhe listened, his eyes were already wandering.

In fact, he is also past middle age, and children can still study, so it is becoming more and more difficult.His wife, father-in-law and mother-in-law were also kind to him, so it became more and more difficult.His parents are naturally aging and they always miss him, so it becomes more and more difficult.My body is average, not too bad but always has problems, so it becomes more and more difficult.

Life is already so difficult, why should you show yourself such an equation?
If forensic medicine calculates the time of death, it must be calculated in this way, then I really might as well die.

Jiang Yuan raised his head and saw that Ye Tianhe had stopped listening, Wan Baoming was silent, and Tang Jia next to him only gave a fixed smile, Jiang Yuan wisely shut up and calculated silently.

Before releasing it, he was actually unwilling to make such a formula, but I heard that some people were willing to read it. Now it seems that normal forensic doctors are not willing to read these things.

After a while, when Captain Ma came back, he saw that several people who had come out of the bathroom still looked uncomfortable, as if they were arguing again.

Team Ma didn't care, and said directly, "If it's a quarter past ten, the husband has an alibi."

"What kind of evidence?" Jiang Yuan still wanted to ask.Alibi, in theory, can also be falsified, especially for those who like to commit perfect murders, there are too many air-to-air discussions, and if it is not complete, someone will discuss it.

Ma Dadu shook his head and said: "The evidence is very strong. This husband works in an outsourced Internet company. There are cameras at the workstations, and there are also cameras when the record is turned on. There are also cameras when entering and leaving the office building. When you leave your seat for a long time, you still have a mobile phone." Warning, unless the company fakes on a large scale, it is impossible."

"That means someone else." Jiang Yuan nodded.

Team Ma hesitated for a moment, and said in a low voice, "Maybe the timing of death shouldn't be so tight..."

"I checked the calculation, and the time of death is not a big problem." Jiang Yuan shook his head.

"Checking?" Team Ma asked one more question.

Jiang Yuan tore off the checking page from the notebook and handed it to Team Ma.

Team Ma saw a large number of letters and numbers, and then showed a purebred human smile: "I don't need to ask."

"This multiple regression equation is not very easy to calculate, but someone must have forged the crime scene, and interfered with and disturbed the temperature of the corpse." Jiang Yuan did the calculation just to clarify his thoughts.

Now that his thinking is clear, he doesn't need to look at those numbers anymore, and said to himself: "Either, the deceased was drugged, and this needs to be tested for toxicology, or someone made changes to the corpse or the environment around the corpse." The bathroom of this family is not big, if the temperature and humidity are raised enough for two or three hours, it is still possible. But..."

Jiang Yuan looked at Forensic Ye and Team Ma, and said, "If it's high temperature and high humidity, you should feel it when you come in."

Ye Tianhe shook his head slightly: "I've only been on the road for 40 minutes. The policeman who responded to the police didn't say anything. Team Ma asked?"

Team Ma said "Yes", and immediately took out his mobile phone to ask.

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

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

Team Ma frowned slightly: "This... If you are not very sure, I think we can put it a little later? Hmm... Suppose someone really faked the scene and created high temperature and high humidity, then there is no high temperature and high humidity now, which means After all, he eliminated the high temperature and humidity ahead of time, could it be that he is an old thief? He sneaked in ahead of time, committed crimes, and left again."

He was purely cooperating with Jiang Yuan. From the point of view of Team Ma, such a complicated case rarely happened.

"If it comes in, there may be traces left." Jiang Yuan simply got up and said, "Let me help you get rid of the game, Ye Fayi, you take the body back for autopsy?"

"Row."

The few people stopped talking and went back to the bathroom to operate.

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

Everything seems to be in order.

Just like before.

Captain Ma and Wan Baoming heaved a sigh of relief at the same time, and then smiled at each other.

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

(End of this chapter)