The little catcher in the police station

The first battle was unfavorable, so Jiang Hao had to make persistent efforts and go to the next one.

After all, there are still more than 200 people who need to be checked, so it is only now.

……

Forensic anatomy room.

Miao Xiaofeng walked past the door and saw Qin Lang dissecting the corpse.

So he didn't bother, walked to the lounge beside him, sat down, and planned to chat with him after he finished his work.

Qin Lang was taking off the pubic bone of the deceased at this time, and saw Miao Xiaofeng from the corner of his eye, so he stepped up the work at hand.

He has specialized in forensic anthropology for many years, and this discipline is mainly a special study of human bones, using some characteristics of human bones to determine the age, height and gender of the deceased.

For the corpses whose identity cannot be confirmed, the police only need to carry this information to conduct investigations and visits, which will eventually help the police to clarify the true identity of the deceased.

Although Qin Lang didn't rest all night, he had already made a simple autopsy report. He first deduced the age of the deceased through the wear pattern of the teeth.

Judgment of age based on teeth is mainly based on two rules, one is to judge age based on the growth and development of teeth, which is suitable for minors.

The second type is judged according to the law of age-related changes after the teeth mature, which is mainly applicable to adults.

Teeth are divided into enamel and dentin. As we age, the cusps will start to wear down and the dentin will gradually be exposed.

Because the wear and tear of teeth changes with strong regularity and is easy to observe, this method has become the most commonly used method for judging age in China.

According to the relationship between tooth wear and age, forensic predecessors divided the degree of tooth wear into nine levels from shallow to deep.

The deceased found in the pool this time had only slight wear on the tips of her teeth, and there was no evidence of exposure of the essential points.

Comparing with the 9-level classification method of tooth wear, it can be concluded that the deceased's teeth belonged to the wear and tear between the first level and the second level, so it can be judged that his age is about 20-25 years old.

The age of the deceased can be determined by more than just teeth.

The error of judging the age through the teeth is relatively large. In a rigorous scientific attitude, in order to ensure the accuracy of the results, another method must be adopted to further infer the age of the deceased. If these two methods Only when the results are consistent can an accurate answer be obtained.

Qin Lang wanted to verify the accuracy of the deceased's age obtained yesterday.

He plans to use other methods to accurately determine the age of the deceased. Determining the age of the deceased through bones is also a commonly used method in the forensic medical field, and this method is also divided into several different methods:

For example, bones such as the clavicle, ribs, sternum, and pubic symphysis can be used to infer their age.

Among these methods, the one preferred by Qin Lang is to infer age based on the pubic symphysis.

And this is the purpose of his autopsy.

The pubic bone is located at the front lower part of the human hip bone, and the pubic symphysis refers to the bony surface where the pubic bones on both sides are relatively combined.

After the human body enters puberty, the shape of the pubic symphysis surface shows strong regular changes with age, and, compared with other bones, the position of the pubic bone in the human body makes the morphological features of the pubic symphysis surface rarely due to changes due to external influences.

After Qin Lang took out the pubic bone, he handed it over to his assistant, preparing to let him treat it with medicine first.

He took off his gloves and washed himself in the sink.

Then go into the living room next door.

"Old Qin, you've been busy all night, don't you want to go back and rest?"

"Have a cigarette to refresh yourself."

Miao Xiaofeng once spent half a year in the Hailing City Criminal Police Brigade. For the same people from Mazhou, the two of them get along as if they have forgotten each other.

He took out a cigarette, handed it to Qin Lang and said, "I'm going to retire soon, and you're still working so hard? Is your body able to take it?"

Qin Lang lit the cigarette, took a puff, and slowly exhaled the smoke: "Seeing such a young life dying in front of my eyes, I still want to do something for her."

Just now, he was still taking the deceased's pubic bone, but now he lighted a cigarette and put it in his mouth without any scruples. It's not an old forensic doctor, who can stand it?

"This is a bit unlike you. Tell me, you have been working as a forensic doctor all your life. What kind of scenes have you never seen? When did you feel sad?"

Forensic doctors, like doctors, are used to seeing life and death, and often have very small emotional fluctuations. They may have some thoughts at the beginning, but with rich experience, such emotional fluctuations will only become minimal.

"Maybe he's about to retire!"

He has been a forensic doctor all his life, and he is about to retire. For him who loves this profession, it is good to stay a second longer.

"By the way, you came just in time. I have something to show you."

As if thinking of something, he quickly snuffed out the cigarette in his hand and threw the cigarette butt into the ashtray.

He got up and returned to the cracking room, and brought a report.

"The test was done overnight. Take a look. We extracted LSD from the corpse."

"LSD?"

Miao Xiaofeng took the test report curiously, and the active ingredients of LSD were indeed found on it.

"I didn't expect that just after an old drug cartel was destroyed, a new type of drug would appear on the market so soon?"

Miao Xiaofeng muttered to himself.

Of course he knows the appearance of LSD. I believe many people have seen the appearance of drugs. There are powder, liquid, solid, pills, and tobacco. However, I believe that not many people have seen drugs made into paper shapes.

And LSD is made into such a paper shape. Because the shape resembles a "postage stamp" drug, it is relatively new, so the police call it a new type of drug.

"Actually, if counted by time, this kind of drug is old-fashioned, not a new type. As early as the 60s, it was very popular in the society of the beautiful country. Drugs." Qin Lang added.

Chapter 228

"So, the deceased took LSD during his lifetime?"

"10 micrograms of LSD can produce obvious euphoria, 50-200 micrograms can produce hallucinations, and it is easily absorbed by the human body.

After taking the drug for 30-60 minutes, the smoker will experience reactions such as rapid heartbeat, increased blood pressure, and dilated pupils. After 2-3 hours, hallucinations, auditory hallucinations, and hallucinations will occur. Sensitivity deformity increases, and the ability to judge things and control oneself gradually decreases or disappears.

At this time, smokers are often accompanied by symptoms such as dizziness, headache, nausea and vomiting physiologically.

When the drug wears off and the hallucinatory period ends, addicts often experience severe depression, and some experience flashbacks.

Fearful responses to this phenomenon sometimes lead to suicidal behavior. "

"So you suspect that the deceased may have died by suicide?"

"I only offer a guess, and the specific judgment must be combined with the actual situation. For example, there are still many unreasonable things on the scene."

Miao Xiaofeng nodded. This is a very important clue: "The deceased took drugs during her lifetime. Does she have a history of drug use? If so, maybe the police database has her DNA data."

"I have already tested her costal cartilage, and I will get her STR typing soon. I will compare it with the information database at that time, and maybe there will be a result."

"That's great, Old Qin, you're so efficient." Miao Xiaofeng was very happy. With Qin Lang's arrival, the efficiency of forensic testing has increased countless times.

It's not that the original forensic doctors are not good, but that there are relatively few murder cases in Mazhou City, and the forensic doctors lack too many cases to practice, so they can't accumulate valuable experience, so there is a lack of experienced senior forensic doctors.

The arrival of Qin Lang filled the talent vacancy in this area of ​​Mazhou City.

And Qin Lang was able to quickly detect the drug components in the corpse, which made Miao Xiaofeng feel that the case was not as simple as he thought, because it also pulled out clues about a new type of drug "stamp".

This is the first time this kind of drug has appeared in Mazhou City.

Once it spreads, the consequences will be disastrous.

"Teacher, the pubic symphysis surface has been processed." Qin Lang's assistant took the processed pubic symphysis surface and handed it to Qin Lang.

"Okay, thank you for your hard work, go and see if the deceased's STR typing result has come out."

"Yes."

Seeing the two bones in Qin Lang's hand, Miao Xiaofeng asked curiously, "Is this the pubic symphysis?"

"Yes, I just want to accurately identify the morphological features above, and then calculate the age of the deceased according to the corresponding formula. The deduced result of this method is very accurate, and the error is only between two years old."

"So that's it, it looks quite simple, show me too."

Miao Xiaofeng saw Qin Lang holding two bones and carefully distinguishing the details on them, so he asked him to take a piece of pubic symphysis noodles.

"This seems to be very simple, but it is a very complicated process in real implementation. Any small subjective error of ours may bring two different results, and this wrong result is very It may lead you into an age misunderstanding."

Qin Lang handed him a piece while talking, and then said: "When we get a new pubic symphysis surface, we first need to make a judgment on the details of the pubic symphysis surface."

"You see, there are 9 reference points for the morphological features of the pubic symphysis, namely the symphysis ridge, the ossified nodules, the lower end of the symphysis, the ventral slope, the dorsal edge, the ventral edge, the source of the symphysis, and the symphysis. Morphology and Joint Facial Bone Quality.

The characteristics presented by these reference points are closely related to the change of people's age. "

Pointing to the pubic symphysis in his hand, Qin Lang introduced like Miao Xiaofeng: "Look, the grooves and ridges of the pubic symphysis will gradually become flatter with age, and the bones of the pubic symphysis will become more and more loose. It is a problem that calcium supplementation cannot solve.”

Miao Xiaofeng had only heard of using the pubic symphysis to judge age before, but no one told him in detail how to judge it, so he listened very carefully.

"I have participated in the analysis of the relationship between the morphological changes of the pubic symphysis and age, and formulated a scoring mechanism based on the changes of each reference point. Morphological characteristics, graded.

Introduce the corresponding grade points into the formula for calculation: Y=M+X1+X2+...X9.

Y=estimated age, M: constant (male M=16.45, female M=15.32), X: grades of each reference point

The age can be deduced through the formula.

Which parameter to quote, and which level to attribute these detailed features to, experience is very critical in this regard. "

As Qin Lang said, he took out the comparison score sheet and started to work.

Although rigorous calculation formulas and standardized experimental data can easily give precise answers, everyone's experience is difficult to quantify.

"Now is the time to test people. Every data and every indicator must be accurate, so that an accurate result can be obtained.

Have you seen?The morphology of the pubic symphysis surface of the deceased was characterized by high and sharp crests, deep and porous grooves, ossified nodules fused and disappeared, the lower end of the fused surface was not formed, the ventral slope was not formed, the dorsal edge appeared ridged, and the ventral edge was not. Formed, the lateral edge of the bevel is not formed, the joint surface is flat, and the joint surface is rough and loose. "

Based on the shape of her pubic symphysis, Qin Lang substituted the formula on the paper to calculate her age.

"Through the pubic symphysis, I calculated the age to be about 19 years old. Combined with the conclusion we drew yesterday, the actual age of the deceased was about 20 years old, and the error is between 2 years old."

The age of the deceased was further confirmed through the real data obtained by two age calculation methods.

"It's really too young, what's wrong with the young people nowadays?"

Miao Xiaofeng was a little bit emotional. Young people nowadays like to try new things and are curious about everything, but they don't have the most basic precautions against drugs.

A new type of drug called "stamp" is very harmful to people.

At this time, Qin Lang's assistant came out again with the test report: "Teacher, the STR typing results are also out."

"Oh, very good, Miao team, then I will trouble you, you can take this result back and compare it to see if there is her data in our information database."

Qin Lang happily handed over the test report to Miao Xiaofeng.

The preliminary work of the forensic doctor is basically over, and the rest depends on whether the detectives of the serious crime team can find out the real identity of the deceased based on the clues provided by the forensic doctor.

If she had been caught using drugs before, she would have been in the police DNA database.

Chapter 229 Strange Action

"Okay, without further ado, I'll go now."

As the autopsy continued to deepen, more and more clues were grasped by the police, especially when new drugs were found in the body of the deceased. Miao Xiaofeng keenly felt that this might be a criminal case, and there was a new drug transaction. The chain is built in the dark.

After getting the DNA data of the deceased, Miao Xiaofeng quickly ran to the technical department, hoping to determine the real identity of the deceased as soon as possible by comparing the data.

By comparing the DNA database of the police, the result was quickly confirmed, and it was checked.

"No? Is there no history of drug use?"

This is unexpected, but also within reason.

At such a young age, the deceased may have just started smoking.

After a while, Yu Anmin also came back, and he brought back all the copies of the surveillance video of Chengyang Square.

"Everyone, work harder, give priority to screening out the surveillance footage on the basement floor, and check her trajectory."

After Miao Xiaofeng gave an order, he was ready to go up and report the progress of the case to Bureau Shen.

The team members of Serious Case Team 3 are investigating the real identity of the deceased together through different channels according to their respective task lines.

Jiang Hao, together with Xu Danying, has checked several clinics, but there are not many clues about braces.

But it was not without good news. Just after coming out of a dental clinic, Jiang Hao got an important clue.

The braces on the deceased's teeth were from a brand called "Su Shuang".

As long as you get in touch with the dealer of this brand, you can use their supply channels to filter out which dental clinics have purchased his brand of braces.

"It's not too late, let's go back and find a phone call." Xu Danying said impatiently.

This news came so timely that they could lock a small area in the middle of finding a needle in a haystack. In this way, they don't need to investigate all the clinics, just go to the outpatient clinics that use this brand of braces.