Early the next morning, eight o'clock.
It was daybreak. Lu Chuan had slept for four or five hours. Although he had not completely recovered, he could continue to endure it.
After analyzing the footprints found in the ravine yesterday, the four sets of tire marks on the roadside were just the appetizer.
The highlight is today, the on-site investigation of the burned vehicles.
There are many ways to destroy the scene. Water soaking, soil burial, etc. are all common methods in murder cases.
For example, corpses are buried in reservoirs and buried under highways.
Of all the ways to destroy criminal evidence, fire can be said to be the most thorough in cleaning up traces.
In general on-site surveys, the most annoying thing is encountering a fire scene.
For example, in the last arson case in the southern suburbs, it was impossible to extract fingerprints at the scene of the fire without some special means.
A ravine near Xinjian Village.
Last night, police officers from two nearby police stations guarded the area all night.
When Lu Chuan and others arrived, the two policemen were sitting in the police car on the roadside.
When it comes to being a person, you have to be Lao Bai.
The saying that people become better with age is true. When he was bringing steamed buns in the cafeteria just now, Lu Chuan thought that the other party was not full.
"Brother, let's get some buns."
The policeman guarding the scene at the police station was an auxiliary police officer. He was a little flattered when he received Lao Bai's buns.
Thank you again and again.
Lu Chuan returned to the professional car for the on-site survey and took out two packs of Chinese cigarettes from his hand: "Thank you two for your hard work."
As a newbie in current exploration, Lu Chuan placed a lot of good cigarettes in any place or car that belonged to the current exploration office.
Liu Guodong and others were too embarrassed to smoke his cigarettes all the time, so he had no choice but to do this.
You can pick it up with your hand, and many of them are still open, so you can dry them without smoking.
When the other party saw Huazi in Lu Chuan's hand, surprise flashed in his eyes. Those who work as criminal policemen are more promising than ordinary policemen.
Their police station chief doesn't necessarily smoke Huazi every day.
"Officer Lu, we can just smoke this."
The tall auxiliary police officer had met Lu Chuan at the scene yesterday and knew that he was the current detective of the Criminal Investigation Detachment. He took out his red plum and the auxiliary police officer waved his hand.
"You're welcome, I spent the whole night squatting, it's hard work."
After that, he threw the cigarette into the police car and went straight down the ravine.
With Baozi and Huazi, the two auxiliary police officers were full and energetic.
Follow Lu Chuan and the others into the ravine.
Liu Guodong stood in front of the abandoned off-road vehicle, looked at it carefully, and sighed after a while.
"Do your best to obey fate and work!"
Lu Chuan opened the survey box he carried with him, put on three layers of gloves, and focused on observing the situation in the driver's seat.
Fingerprints on the steering wheel...don't even think about it.
The rubber had been burned, and Lu Chuan's advanced fingerprint collection skills, let alone his intermediate ones, couldn't do anything.
Even if the carrier is gone, it would be a fantasy to still be able to collect fingerprints.
However, when people drive, they don’t just leave fingerprints on the steering wheel.
Fingerprints may be left on gear handles, handbrakes, door handles, etc.
Lu Chuan mainly observed some metal parts that were not burned.
These places were so smoky that they turned black.
It is very difficult to collect fingerprints.
Liu Guodong and the others knew that Lu Chuan was good at collecting excessive fingerprints, so they left this job to him.
The three of them were conducting surveys at the front of the car.
"There is still blood left in this part, collect it."
The vehicle burned and exploded, but not all evidence was destroyed.
The traces of the bumper impact were still there, and there were bits and pieces of dried blood in the gaps.
When the murderer burned the vehicle, he sprayed gasoline both inside and outside, which caused the vehicle to burn more fully.
The interior was completely unrecognizable, completely melted, and all that was left of the seats were their supporting iron frames.
All the car lights were melted, and the plastic parts were basically not intact.
Fortunately, the burning of the vehicle was not due to the impact, so the engine part was just overheated, and the rubber sleeves and other things were burned out, but it was not completely damaged.
"Xiao Lu, how was the examination?"
Lu Chuan, who was leaning halfway into the car, sighed: "The interior is completely ruined."
"The paint on the car has been burned away, and there is basically no possibility of extracting fingerprints from the door handles or the surface of the car."
"I found some curled plastic debris under the dashboard to see if I could find any fingerprints from the inside."
The damage to the vehicle was more serious than expected.
Fortunately, Li Kai and the others didn't use a fire extinguisher when they discovered it yesterday, otherwise they wouldn't have seen anything.
There are only two takeaways from the survey of the vehicle.
Suspected blood residue was found in the gap after the front bumper was smashed.
There is a high probability that they are traces left when Sun Kun was hit, and because they are hidden in the gaps in the vehicle frame, they can still be collected even though they have dried up due to the high temperature.
Another thing Lu Chuan found was a curled interior panel. From the appearance, it was no longer possible to tell where it once belonged.
But the inside after curling may be relatively intact.
Take it back and process it. If you're lucky, you can collect fingerprints.
After the vehicle inspection was completed, Liu Guodong called the traffic police team to tow the car away.
Such vehicles involved in murder cases will be sealed in the special parking lot of the traffic police detachment.
When the case is solved, when will the next step be taken?
Existing exploration laboratory.
Liu Guodong is processing the blood stains collected.
"DNA information cannot be identified, but blood type can be determined."
Lu Chuan nodded. Blood type testing is based on the uniqueness of the antigens on the surface of red blood cells.
This antigen is essentially a protein. Although high temperature will damage the protein structure, the chemical reaction will not disappear.
The final blood type test results were consistent with Song Kun's type A blood, which can be used as supporting evidence that the burning vehicle was indeed the vehicle that hit Song Kun.
Of course, this is just one piece of evidence, and debris scattered at the impact site can also be used as evidence.
The blood test has made some progress, but Lu Chuan's fingerprint collection was very unsatisfactory.
Although the fragments of the interior panel have been processed and the inner layer has been opened, Lu Chuan's luck was a little worse this time.
The killer left no fingerprints on the interior.
It can be said that the murderer's method of setting fire to the car to eliminate his own traces was very successful.
Solving crimes depends on both skill and sometimes luck.
During the Liang Qi kidnapping case, Lu Chuan was very lucky and met the suspect while stalking.
Of course, it can also be said to be poor, because he met the suspect alone and his identity was discovered.
A week passed quickly.
The atmosphere in the criminal investigation detachment was very depressing, with everyone staring at the dark circles under their eyes and their heads in chicken coops.
Qin Yong even slept in the office for seven days and never returned home for a day.
Ren Qiang, Sun Jun and other criminal policemen from the action team have not even returned to the office a few times, let alone going home.
Everyone rushed to the scene.
However, just like Lu Chuan, his luck in solving the case was a little better this time.
There has been no major substantive progress in the Song Kun murder case so far.
Of all the clues, there are still only two.
