Transferring to the main driver, Chen Yan squatted on the ground and carefully observed the blood volume in the driver's seat.

The driver's feet were already covered in blood. Chen Yan lightly touched a little blood and rubbed it gently. The blood was thick but not completely coagulated.

Taking into account factors such as the degree of rigor mortis, blood coagulation, temperature and other factors of the deceased, it was comprehensively judged that the time of death of the deceased did not exceed eight hours.

It is already 12:30 noon, which means that the deceased should have died around 4:30 in the morning.

All four car doors had been opened, and Chen Yan looked around in circles.

In addition to the pungent smell of blood, there was also a strong smell of alcohol in the carriage.

The smell of alcohol was very strong. It didn't look like it was left by a drunk passenger, but it looked like someone had specifically sprayed the car with alcohol.

Apart from that, there is no other smell in the cabin.

Chen Yan frowned deeply, and the other party was very cautious.

After the car was disinfected with alcohol, other odors were basically eliminated, and Chen Yan's olfactory gene lock found nothing special.

This is the first time Chen Yan has encountered this kind of situation. If this was planned by the murderer in advance, then this person would be terrible.

In addition, no visual gene locks were found.

There were no traces of fingerprints found on the door handles, steering wheel, door armrests, or Chen Yan.

"Team Wang, have your fingerprints been collected?"

Although Chen Yan's visual gene lock is powerful, there is a strict process for collecting fingerprints. If you can't see it, it doesn't mean it doesn't exist.

Fingerprint collection is usually carried out in a secret room indoors, using special lighting, and then taking photos to collect fingerprints.

However, although this method is accurate, it can only be used to collect evidence fingerprints of small objects.

Naturally, it is impossible to move something like a taxi into a secret room. It can only be developed with chemical spray and then collected with stickers.

As a result, Wang Fenglei shook his head: "No fingerprints were collected!"

"In this case, we immediately judged that it was committed by the murderer ten years ago. On the one hand, the weapon used and the killing method, and on the other hand, the handling of the scene."

"This was the case with the first case that the other party started fifteen years ago. The other party used alcohol to disinfect the car without leaving any valuable smell. We even deployed police dogs at the time, but there were still no clues."

"There are also fingerprints. From the first case, we have not extracted any fingerprints."

"The murderer not only sprayed alcohol to eliminate the odor, but also wiped the entire car, including the seats, armrests and even the steering wheel, handbrake lever, glass, etc."

"There are also no fingerprints on the door handles on the outside of the vehicle. These details were kept confidential when the case was solved and have never been leaked. That's why I concluded that the murderer of this attack was the serial murderer ten years ago. !”

call!

clean!

Chen Yan can only describe the murderer's methods as clean.

No fingerprints, no hair, not even a smell!

Although the other party did not know that Chen Yan was very sensitive to smell, the other party obviously considered the situation of the police dog.

No wonder this serial case has not been solved for fifteen years.

You must know that the entire Liao Province Detective Brigade and the Shen City Detective Team are definitely among the most elite in the province in terms of ability and quality.

Wang Fenglei was a star figure in the Liao Provincial Detective Brigade back then. Otherwise, he would not have become the deputy captain of the Liao Provincial Detective Brigade at the age of less than fifty.

None of these people are fuel-efficient.

And so many people have not solved the case for more than ten years. This shows that it is not a problem of ability, but that the murderer is indeed very cunning.

To be honest, this is the first time Chen Yan has encountered such a situation.

There was no trace of a taxi at the scene of the crime. There were no fingerprints, skin flakes, or hair. The personal odor had also been removed by alcohol.

However, even if the murderer leaves no personal traces, some cases are state evidence and cannot be eliminated if the murderer wants to.

For example, the status of the meter.

The vehicle meter is currently in an empty state, and there are no fingerprints on it.

What does this mean?

Normally, only drivers will touch the meter, and passengers generally will not touch it.

However, the current status of the meter is empty. Why?

Judging from the deceased's state of death, it is certain that the murderer must be the last passenger.

After subduing the driver by some means, he used a probe to bleed and killed the driver.

So, while the driver was being killed, was it possible to adjust the meter by yourself from the metered state to the empty state?

impossible.

Anyone who has ever taken a taxi knows that taxi drivers usually only adjust the meter to empty status after the passengers pay and leave the taxi.

Therefore, this meter can only be adjusted by the murderer.

The murderer had adjusted the meter and left traces on it, so he cleaned the fingerprints on the meter and could not extract any fingerprints from the meter. Otherwise, at least the driver's fingerprints would be on it. .

So why did the murderer adjust the meter?

There is only one possibility: the other party is concealing the distance of his ride.

The starting price of a taxi in Shen City is ten yuan, and the starting mileage is three kilometers.

For each kilometer exceeded, the price is 1.6 yuan.

Therefore, as long as you know the last amount displayed on the meter, you can delineate the distance range where the murderer appeared centered on the crime scene.

As for the vehicle positioning system, all taxis in Shen City were installed only five years ago.

However, the system installed on the taxi can only locate the vehicle's last stop location and cannot query the trajectory.

In this way, it is difficult to determine when and where the murderer got in the car.

Fortunately, there is already a Sky Eye system, and we may be able to make some discoveries in this regard.

In addition to the meter, there is also a handbrake lever.

Chen Yan just tried to pull the handbrake and found that the handbrake was very tight and had been pulled to the extreme position.

This situation is problematic.

Because ordinary experienced drivers will not do this, tightening the handbrake too tightly will cause metal fatigue of the handbrake cable and affect its service life.

Generally, experienced drivers will pull down the handbrake to an appropriate position, which not only ensures that the car does not roll away, but also maximizes the service life of the handbrake cable.

There is no reason why taxi drivers don’t know things that experienced drivers know.

So, the murderer pulled the handbrake of the vehicle?

Leaning down, Chen Yan watched carefully and then looked at Wang Fenglei: "There are no fingerprints collected on the handbrake lever, right?"

Sure enough, Wang Fenglei shook his head: "No."

A handbrake lever that only the driver can touch has also been cleared of fingerprints, which means that the murderer did touch the handbrake lever.

But why?

To prevent the car from rolling away?

Or did you drive the car away to prevent the driver from resisting when he was killed?

He took two steps back, kept a certain distance away from the vehicle, and continued to observe.

Wang Fenglei had just told Chen Yan the general story of the four previous cases carried out by the murderer, and it was exactly the same as this time. No information was left behind.

call!

Chen Yan let out a breath and frowned.

This was the first time that Chen Yan encountered such a murderer.

There's really nothing left.

However, if this is really the case, even if the murderer is caught, what evidence will be used to convict him?

No!

impossible!

The murderer will definitely leave information, and it cannot be completely eliminated. Otherwise, what is the difference between this and a perfect crime?

In this world, there is no perfect crime.

So, where is the flaw?

Chen Yan, who was squatting on the ground, felt some numbness in his legs. Just as he was about to get up, he suddenly caught a glimpse of the driver's body lying on the steering wheel in the driver's seat.
Chapter completed!