Chapter two hundred and twenty eight pubic symphysis
"So, the deceased took LSD before he died?"
“10 micrograms of LSD can produce obvious ecstasy, and 50-200 micrograms can cause hallucinations. It is easily absorbed by the human body.
After taking the drug for 30-60 minutes, smokers will experience reactions such as accelerated heartbeat, increased blood pressure, and dilated pupils. After 2-3 hours, they will have visual hallucinations, auditory hallucinations, hallucinations, and confusion about surrounding sounds, colors, smells, and other things.
The sensitivity abnormally increases, and the ability to judge things and control oneself gradually decreases or disappears.
At this time, smokers often experience physiological symptoms such as dizziness, headache, nausea and vomiting.
When the effects of the drug wear off and the psychedelic period ends, drug users often feel severe depression, and some people even experience relapses of hallucinations.
Fearful reactions to this phenomenon can sometimes lead to suicidal behavior."
"So you suspect that the deceased may have committed suicide?"
"I only provide a guess. The specific judgment must be based on the actual situation. For example, there are many unreasonable places on the scene."
Miao Xiaofeng nodded, this was a very important clue: "The deceased took drugs before her death, so did she have a history of drug abuse? If so, maybe the police database has her DNA data."
"I have tested her costal cartilage and will soon get her STR type. I will compare it with the information database and maybe I will have the result."
"That's great, Lao Qin, you are so efficient." Miao Xiaofeng was very happy. With the arrival of Qin Lang, the efficiency of forensic testing has increased countless times.
It’s not that the original forensic doctors are not good, but there are relatively few murder cases in Mazhou City. The forensic doctors lack too much case practice, so they cannot accumulate valuable experience, so there is a lack of experienced senior forensic doctors.
Qin Lang's arrival has filled Mazhou City's talent vacancy in this area.
Qin Lang was able to quickly detect the drug content in the corpse, which made Miao Xiaofeng feel that the case was not as simple as he thought, because it also revealed clues to the new 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 has been processed." Qin Lang's assistant took the processed pubic symphysis and handed it to Qin Lang.
"Okay, thank you for your hard work. Go and see if the STR typing results of the deceased have come out."
"yes."
Miao Xiaofeng saw the two bones in Qin Lang's hand and asked curiously: "Is this the pubic symphysis?"
"Yes, I just want to accurately identify the morphological features on it, and then calculate the age of the deceased based on the corresponding formula. The results deduced by this method are very accurate, and the error is only between two years old."
"I see. It looks pretty simple. Let me have a look."
Miao Xiaofeng saw Qin Lang holding two bones and carefully distinguishing the details, so he asked him for a piece of pubic symphysis.
"This seems very simple, but in actual implementation, it is a very complicated process. Any small subjective error on our part may bring two different results, and the result of this error will be very serious.
It may lead you into an age misunderstanding."
As Qin Lang spoke, he handed him a piece, and then said: "When we get a new pubic symphysis, we must first make a judgment on the detailed characteristics of the pubic symphysis."
"You see, there are 9 reference points for the morphological characteristics of the pubic symphysis surface, which are the symphyseal groove ridge, ossified tubercle, lower end of the symphyseal surface, ventral oblique surface, dorsal edge, ventral edge, inclined surface origin, and symphyseal surface
Morphology and symphyseal bone quality.
The characteristics presented by these reference points are closely related to people's age changes."
Qin Lang pointed to the pubic symphysis in his hand and introduced it to Miao Xiaofeng: "You see, the symphyseal ridge will gradually become flatter from high to sharp with age, and the bones of the symphysis will become more and more loose. This
This is a problem that even calcium supplements cannot solve.”
Miao Xiaofeng had only heard of using the pubic symphysis to determine age before, but no one told him in detail how to determine it, so he listened very carefully.
"I once participated in the analysis of the relationship between the morphological changes of the pubic symphysis surface and age, and developed a scoring mechanism based on the changing patterns of each reference point. We only need to compare the scoring mechanism and evaluate the performance of each reference point on the pubic symphysis surface of the deceased.
The morphological characteristics are evaluated and graded.
Introduce the corresponding grade points into the formula entry calculation: Y=M+X1+X2+...X9.
Y=inferred age, M: constant (male M=16.45, female M=15.32), X: grade score of each reference point
Through the formula, the age can be inferred.
Which parameter to quote and to which level these detailed features should be attributed, experience is very critical in this regard."
Qin Lang said as he took out the comparison score sheet and started working.
Although rigorous calculation formulas and standardized experimental data can easily yield accurate 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 we can get an accurate result.
Do you see it? The morphological characteristics of the pubic symphysis surface of this deceased person are high and sharp ridges, deep and porous grooves, ossified tubercle fusion disappears, the lower end of the fusion surface is not formed, the ventral slope is not formed, the dorsal edge appears with a ridged edge, and the ventral slope is not formed.
The lateral edges are not formed, the beveled lateral edges are not formed, the symphyseal surface is flat, and the bones on the symphyseal surface are rough and loose.”
Qin Lang calculated her age based on the shape of her pubic symphysis and inserted the formula into the paper.
"Through the pubic symphysis, I calculated the age to be around 19 years old. Combined with the conclusions we reached yesterday, the actual age of the deceased was around 20 years old, with an error of 2 years."
Through the real data obtained by two age calculation methods, the age of the deceased was further confirmed.
"You are so young. What's wrong with young people today?"
Miao Xiaofeng lamented that today's young people like to try new things and are curious about everything, but they don't have the most basic precautions against drugs.
This 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, Captain Miao, I'd like to trouble you. You can take this result back and compare it to see if we have her data in our information database."
Qin Lang handed the test report to Miao Xiaofeng happily.
The preliminary work of the forensic doctor has basically been completed, and the rest depends on whether the detectives of the crime team can find the true identity of the deceased based on the clues provided by the forensic doctor.
If she had been caught taking drugs before, her data would be in the police DNA database.