Chapter 10, The Hidden Bloodstains

Xu Dayuan went to adjust the surveillance to check on the person, while Zhou Ning and the others hurried to inspect the two vehicles

Pushing the door open and getting out of the car, Zhou Ning stood in front of the vehicle, carefully examining it.

Swab: It can be understood as an elongated version of a cotton swab, with a breakable head, commonly used as a tool for collecting microorganisms, exfoliated cells, or secretions in medical examinations

Do not rush, if we are to perform sheet metal painting, it will naturally be incomplete. I observed inside, the screws on the engine cover and other areas show no signs of having been turned, indicating that these have not been replaced. The deceased did not have a broken calf, which means that the vehicle was traveling at a high speed and struck the deceased's leg, directly lifting the person and throwing them out.

driver

As for who was responsible for the death of the victim, the outcome is self-evident. However, why was Wang Fuhao in such a hurry to repair the car and assist Chen Yufei in concealing this evidence

Only a few fingerprints from the gloves were found, and no other discoveries were made. It seems that this vehicle has been thoroughly cleaned, and the interior has been deodorized.

Zhou Ning's mistakes are indeed as I expected; you are trapped in a pit within a pit. If I had not analyzed it myself, this task would have been impossible to submit, especially since the submission page has not even opened.

This discovery left Zhou Ning in silence

Zhou Ning recorded the recently collected fingerprints and palm prints with their respective numbers, and similarly processed the fingerprints labeled with Yang Feiyu and Wang Fuhao on the table, before proceeding to click for comparison

Countdown remaining time: 33:30

Vehicle involved in the incident: Volkswagen 2010CC

Excluding a few that are too incomplete to be compared, several fingerprints have shown successful matches, and the comparison results can be printed directly by clicking.

Zhou Ning stood in front of the train head, remaining silent for several minutes. A few criminal police officers seemed to want to say something, but were stopped by Zhao Xinli. He had come to understand the temperament of this young forensic doctor, and he thought that Zhou's deep contemplation was not a bad thing; perhaps he would come up with a good solution shortly.

Zhou Ning slumped in the chair, breathing heavily, his mind curiously flipping through the knowledge he had learned in forensic science. Unable to compare other effects, he directly turned to the last part of the section on rubber trace examination, finding the paper provided at the end.

Didi, two beeps sounded in my ear, and a task submission page popped up on the transparent display screen, showing three conditions.

Zhao Xinli was kneeling in the passenger seat of the Nissan, with a piece of isolation clothing under his knees. Indeed, there were fingerprints and palm prints on the gear lever

Picking up the comparison results, before he could rise, the office door was pushed open directly. Xu Dayuan strode in and, seeing the expression on Zhou Ning's face, he asked hopefully

Impressive, Forensic Doctor Xiao Zhou, this windshield has indeed been replaced. Although it is original factory glass, the production date is incorrect

Congratulations to the binder, the temporary task has been submitted successfully

Hand me the camera, and also give me the sampling swab [2]

Zhou Ning threw the items to Zhao Xinli and walked towards the public CC

Zhou Ning spoke rapidly, and the movements of his hands were even quicker. He dipped a swab in distilled water, collected a blood sample, broke one end off, and placed it in a test tube before handing it to Zhao Xinli

Evidence

No, the deceased not only suffered fractures of the left tibia and fibula, but there are also glass fragments on her left cheek, and there are bruises around her eye socket. This indicates that after her leg was struck, the side of her head collided with the glass.

The windshield, bumper, and headlights have been replaced. If these removed parts are destroyed and the suspect still refuses to admit involvement, then this vehicle cannot be identified as the one involved in the accident. It can only be proven that the two individuals participated in illegal street racing, indicating that they must have overlooked something.

... ...

Zhou Ning was somewhat taken aback; the car had been repaired, and the interior had been cleaned so thoroughly. How could it be proven that this vehicle was involved in the accident

If this is the case, the damage to the car is not severe; replacing the bumper and the headlight will suffice, and no traces will be visible. Of course, if we replace it with the same model, it will be even less noticeable. As for the tires, I also see that they have been replaced.

PS:

Zhou Ning's eyes flickered, which means that the current answer is not incorrect, but rather not sufficiently standard, or in other words, his answer is correct, but not comprehensive enough and lacks evidence

Evidence: Fingerprint collection completed, bloodstain extraction and comparison successful

Zhou Ning began to move, finding a bottle of luminol reagent [1], and quickly sprayed it evenly on the engine hood. In the center of the engine hood, two column-like shapes and a large area of blue-green fluorescence appeared.

Cannot

Are there no findings here

Impressive, this has gained three more years of new knowledge

Zhou Ning instinctively sat down, as the discomfort from the last loading process still lingered in his mind. Fortunately, this time he was in his own office. Indeed, that overwhelming sensation returned, but it was not as uncomfortable as the first time.

This idea was directly overturned by Zhou Ning. If it were wrong, according to the nature of this system, it would have long since emerged to downgrade the previous rewards.

Brother Zhao, do you think it is possible to repair a car that has been in an accident to a brand new condition within 24 hours

Zhao Xinli quickly handed over the camera, then found the test tube and swab, leaned closer to Zhou Ning to watch him take pictures, and eagerly asked.

vehicle involved in the accident

Luminol, also known as luminescent ammonia, has the chemical name 3-amino-1,2-benzenedicarboxylic hydrazide. At room temperature, it appears as a pale yellow powder and is a relatively stable synthetic organic compound.

Due to the presence of iron in hemoglobin, which can catalyze the decomposition of hydrogen peroxide, converting it into water and singlet oxygen, the singlet oxygen then oxidizes luminol, causing it to emit light. Therefore, luminol is widely used in fields such as criminal investigation, bioengineering, and chemical tracing.

Unlike the first task submission, where it directly indicated that the task was submitted successfully and proceeded to the reward draw, what is the reason for this? Did I answer incorrectly?

Several fingerprints emerged, and Zhou Ning carefully extracted them

After waiting for quite a while, the system showed no response at all

Indeed, the date of the last paper is 2019, [Year (Volume) Issue] 2019 (036) 008, and Zhou Ning is excitedly rubbing his fists together

Upon touching that Volkswagen CC, Zhou Ning thought to himself, submit the temporary task: this is the vehicle involved in the incident

Zhou Ning was taken aback, and Zhao Xinli quickly opened the engine cover, pointing inside as he spoke

As Zhou Ning's thoughts emerged, a familiar notification sound rang in his ears

What did forensic expert Xiao Zhou discover

This feeling lasted for a long time, and Zhou Ning even felt as if time had slowed down. With the sound of two beeps, all discomfort dissipated

In deep thought, Zhou Ning recalled the injuries between the ribs of the deceased, as well as the content of the现场采样 learned last night, and suddenly had a moment of clarity

Upon careful consideration, it seems that this temporary task has two requirements

Zhao Xinli decisively shook his head

Zhou Ning carefully extracted the items, holding them up while looking at the Volkswagen CC on the side. Three people were searching the car, yet there was no movement at all at this moment

This discovery greatly boosted Zhou Ning's confidence. He leaned over from the side of the car's front, spraying luminol reagent into the gap where the windshield meets the hood, and indeed, there was a fluorescent reaction here as well

The computer with the large belly display may appear shabby, but its performance is quite decent, and it is equipped with a fingerprint comparison software.

Upon hearing this, Zhao Xinli leaned from the side against a corner of the windshield, holding a magnifying glass and examining it for a long time, his eyes suddenly brightened

Zhou Ning clenched his fist and waved it slightly, excellent. Although there are no fingerprints in the Volkswagen CC, the fingerprints of Wang Fuhao can still be found on the door and gear lever of the Nissan, which indirectly proves that Wang Fuhao did not lie; they indeed switched cars.

The rewards are being distributed, with a loading time of ten minutes

Cannot

Zhao Xinli did not waste any words, grabbed the bottle and ran off, while Zhou Ning climbed down from the vehicle, took the fingerprints and palm prints he had just collected, and headed straight to the office on the second floor

Collecting fingerprints does not require much technical skill; it simply demands attention to detail. Zhou Ning did not rush to get into the car. He meticulously brushed every area that could be touched when opening the car door, including the door handle, the window, the upper edge of the door, and the central control switch, using a special powder on a fine brush.

In forensic science, the luminol reaction can identify bloodstains that have been scrubbed and are from a long time ago. In biology, luminol is used to detect the presence of copper, iron, and cyanide in cells

Zhou Ning adjusted his glasses, and the image discovered at the primary crime scene of the deceased appeared on the transparent display screen, continuously rotating. Zhou Ning stared at the glass shards on the deceased's cheek, slowly shaking his head

"Forensic expert Xiao Zhou, I have also found several fingerprints here"

On the windshield wiper cover, Zhou Ning discovered two dark purple blood droplets and waved at Zhao Xinli

Driver: Yang Yufei

Bloodstains, I suspect these are the bloodstains of the deceased, found on the wiper cover, likely overlooked during the cleaning, only the blood on the hood was wiped away

How is it? Have any evidence been found?

With a sigh, Zhou Ning looked at the several criminal police officers surrounding the car. Zhao Xinli had already taken down the investigation box and distributed the items.

Although sampling cannot be conducted here, the two bar-shaped formations are completely consistent with the bloodstains located beneath the right ribcage of the deceased. I have collected samples of the blood; you should promptly send this to the county hospital's laboratory for blood type comparison with that of the deceased, as this can be done at the county hospital

That is to find the vehicle that struck the deceased and the perpetrator. It seems to have been done hastily. During the first task, he did not even consider submitting it; the idea just popped into his mind, and he thought the task was completed.

For blood that is not visible to the naked eye at a crime scene, luminol reagent can reveal extremely small traces of blood (luminol reaction). At the same time, luminol is a relatively strong weak acid and has a certain irritating effect on the eyes, skin, and respiratory tract