When she was just moving the corpse with Lu Chuan, Shen Yan found that the corpse had been somewhat soft and thawed.

But there is still some way to go before an autopsy can be performed. There is a strict process for dissecting a cadaver.

Contrary to what most people think, dissecting a corpse cannot just be cut open and looked at if there is a problem.

There is a strict order of dissection. An autopsy report should be completed to begin with the examination of the scar on the surface of the body.

Some are similar to customized template sets, from the position of the knife, the order of dissection, toxicological pathology experiments, etc., from top to bottom, from outside to inside.

Although Lu Chuan is not a forensic doctor, he has also been exposed to some basic knowledge of anatomy. After restoring the body to a flat lying position with Shen Yan, Lu Chuan and Shen Yan left together.

Today, much of the work is focused on visiting the crime scene. Confirming the identity of the deceased is a top priority, one group of Sun Jun and others are responsible for following up the scene, and the second group of Ren Qiang has a robbery case, which is very busy, so Zhang Hui can only bring an auxiliary police officer to participate in the investigation of the surveillance video.

There are only some old communities near the Qinghe amusement park construction site, and there are very few monitoring facilities, and when the playground is built, it is almost demolished.

Within the scope of inspection, only the monitoring at the main entrance of the construction site is working normally. But it is clear that the murderer did not carry the body past the main entrance, and the surveillance basically found nothing.

After Lu Chuan completed the collection of trace physical evidence, there is still new work to follow. Around the scene of the murder, a radius of one kilometer, especially the physical evidence found inside and outside the wall, was all brought back.

This includes but is not limited to mineral water bottles, cigarette boxes, cigarette butts, lighters, yogurt bottles, plastic bags, toilet paper, etc.

Although these things cannot all be left by the murderer, there may be items left by the murderer if they are not kept together.

Maybe it wasn't left by throwing the body in the early morning, but since the murderer chose this dumping site, it shows that the murderer is more familiar with the vicinity of the Qinghe Playground construction site.

Since you are familiar with it, it is possible that you have been here more than once. What Lu Chuan is doing now is to collect fingerprints and DNA samples from all the physical evidence found.

In terms of fingerprint collection, Lu Chuan has great confidence and adopts different methods for different samples, and Lu Chuan, who has mastered intermediate fingerprint collection skills, can be said to be handy.

A little more troublesome is the collection of DNA samples. Generally speaking, DNA samples are collected by methods such as blood sampling, hair sampling, nail sampling, cigarette butt sampling, oral swab sampling, toothbrush sampling, sperm spot sampling, and chewing gum sampling.

Each sampling method has different requirements. Most of the DNA information that can be extracted by wiping a cotton swab casually with a cotton swab is a joke.

For example, hair sampling, in general, to ensure that some successful hair DNA information collection is done, you need at least five hairs with clear hair follicles.

And the freshly plucked hair should be placed on clean white paper to dry for a few minutes before being put into a bag. Cut, severed hair is not usable.

Another example is oral swab sampling, which requires rinsing the mouth with water from the person being collected to ensure that there is no food residue in the mouth.

After that, use a medical cotton swab and wipe at least 30 times on the inside of the mouth and cheeks. There is another step later, the cotton swab is placed in a clean place to dry in the shade, not in the sun, not in the hair dryer and not in the air.

Finally, at least three swabs should be collected in the same way to ensure a successful DNA information test.

Therefore, the items found around the scene can collect DNA information, and it is definitely a very small number of samples.

Lu Chuan carefully sorted out the items, checked them one by one, and then dried them in the shade and sealed them in the package.

A hundred evidence bags are enough for Lu Chuan to work all night. Fortunately, the current field survey office is fully staffed, Lu Chuan is sorting out the physical evidence, and Yang Sen began to preprocess the samples collected by Lu Chuan, preparing to use the instrument for experiments.

Lao Bai is not idle, after Lu Chuan has processed the physical evidence, he will continue to number, process the corresponding document information, and establish the physical evidence of the case.

This is where the complexity of the murder case lies, every detail must be completed in accordance with the most stringent standards and the strictest process.

Even if it is an inconsequential screw, as long as it appears at the scene of the murder, it must be taken back, and after several chews on the spot, it can only be put away until the case is solved.

Of course, not all homicide cases can be solved, and if they become backlogged, they will be turned out again after a year or two, and chewed again until the case is solved.

The case was never solved...... Just do it again. The cycle goes back and forth, lingering and compassionate, life and death depend on each other, and never die.

11:16 p.m.

"Brother Yang, you guys go back first, there's not much left, I'll just keep an eye on it." Yang Sen has a son who wants to take the college entrance examination at home, Lao Bai is old, and Lu Chuan has shown his due responsibility for staying up late.

Yang Sen looked at the time, straightened his waist, took a breath, and took out two soft Chinese on the table, one for himself and one for Lao Bai.

He didn't give it to Lu Chuan, because he had observed it many times, and Lu Chuan's so-called smoking was to light it and hold it in his hand.

Occasionally, two puffs are also passed in the mouth. As an old smoker, Janssen knows whether the breath is inhaled into the lung cavity and smells, and he doesn't need to look at whether the color of the smoke is light blue or light gray.

Lao Bai took the cigarette: "Are you alone?" ”

"No problem, that's all there is to it, and it will be done in another hour or two." After chatting for a while, Yang Sen and Lao Bai withdrew first.

Liu Guodong was still in the conference room on the first floor and did not come back, Lu Chuan sighed, knowing that the case was not going well.

A day has passed, and the identity of the deceased has still not been determined. There are no results for fingerprint comparison, no results for DNA information comparison, and no results for missing person comparison.

Soon after the two left, Liu Guodong entered the laboratory with a tired face.

"Lao Bai, they are back?" Lu Chuan nodded and handed Liu Guodong tea: "Just left for a while, there are not many things left, there is still more than an hour to finish, and the results will be available early tomorrow morning." Liu Guodong nodded: "Wait for you to come back too, I'll keep an eye on it here." ”

"Master, let's go back, I'll be fine when I go home, I'll sleep in the office today." Liu Guodong shook his head: "I won't go back either, my wife and children are asleep at this point, and I will wake them up again when I go back." The two chatted for a while, and the work in Lu Chuan's hand was completed.

All of the 126 pieces of physical evidence were sampled with fingerprints and DNA samples. The rest is comparison and analysis.

But tonight will certainly be too late, and both tasks will need to be pushed forward tomorrow. Liu Guodong slept on the sofa, and Lu Chuan moved the marching bed.

In fact, the criminal investigation detachment has dormitories, but basically they are all assigned to single dogs, and there are only two or three emergency rooms, and the leaders are not enough to sleep.

Bang bang bang! Lu Chuan and Liu Guodong were awakened by the sound of slamming the door. It was Zhang Hui who smashed the door.

"Brother Hui, what's wrong?" Lu Chuan, who was sleepy-eyed, looked at the time, and it was less than half past six in the morning. The two went to bed at two o'clock last night, and only rested for more than four hours.

Zhang Hui, who smashed the door open, had an extremely ugly face: "Something happened again!" ”