There are no advantages or disadvantages of the four methods of on-site photography, and each method has its own application scenarios and advantages.

For example, the central photography method used by Lu Chuan this time is to record the characteristics of the central object at the scene, as well as the relationship with neighboring objects and traces.

It is characterized by the magnified proportion and sensitivity of the evidence, which can completely restore the situation at the scene.

When comparing tire tracks, the size of the mark and the color of the mark are important factors in the comparison, so it is most appropriate to take a center photographic method.

As for the detail photography, it's the details that stand out.

In the on-site survey and photographic procedures, only the detailed photographic method can take pictures of individual traces and items out of the surrounding environment, reflecting the shape, size and detailed characteristics of the traces and items on the spot.

The requirements for detailed photography are relatively detailed, and it is necessary to ensure that the traces and physical evidence are parallel to the lens and photosensitive film, and that the objects and traces are not deformed.

At the same time, the use of detailed photographs should also follow the principle of proportional photography to accurately reflect the size, thickness and length of the photographed traces and physical evidence.

For example, the degree of wear of the tire tread, the details of specific damage, these small marks, are easier to compare and analyze using detailed photography.

Lu Chuan has the basic field survey and photography skills in hand, and these tasks are going smoothly, and it is not a problem to complete an ordinary center photo and detail photography.

The focus is on the modeling of the tire tracks after that.

In tire trace analysis, comparing the same requires not only a photograph, but also a fixed model.

Of course, the time is tight now, and it is too late to shape the model, and there is no need to do so.

These tasks are only used after the case is solved and tire tracks are needed as evidence.

As for model making, there are relevant skills in the Intermediate Tire Track Identification Analysis.

This is a bit like the work of a dentist, because dental plaster is used.

Dental plaster is different from regular plaster in that it hardens faster after the object is instilled.

General dental plaster is made from β model gypsum powder, while dental anhydrite is generally prepared with α gypsum powder.

There is also a dental super-anhydrite, which uses a special α gypsum produced by the liquid phase method as the raw material.

The three types of dental plaster are all occasionally used in forensic medicine and trace examination, and different types of plaster are selected according to different use scenarios.

Conducting a survey of a car, Lu Chuan had no similar experience before.

Fortunately, Wang Hao and they are also there, these people are all veterans of the current survey, and it is not a problem to do this kind of current survey.

As for the DNA sample taken from the basement yesterday, the comparison has been processed.

The results of the comparison are not gratifying, or not very gratifying.

A total of six people's DNA information was found, and only one person was hit, which was the missing Goldman Sachs.

Now, it is almost certain that Goldman Sachs has been killed.

There was no blood in the BMW, the car was clean.

However, some hair and dander were found in the trunk.

The DNA detector is going to get busy again.

In the morning, the preliminary work of the field survey was basically completed, and the corresponding DNA samples were also being processed.

Results should be available in the afternoon.

And the front line, which Li Donglin is mainly concerned about, finally came with good news.

Wang Liang, the boss behind Twenty-Nine Biological Co., Ltd., finally found it.

It's not in BZ City, it's hiding in the provincial capital, and it's going to do it directly.

Lu Chuan used fingerprint identification to analyze the three people, and two of them were also found.

These two people are in the First People's Hospital of BZ City.

One of them was a sick man who had just had a kidney transplant.

The other was his attending doctor.

The patient has been contained in the hospital, and the doctor has been summoned to custody.

In Li Donglin's words, a doctor's fingerprints appear on the operating table in the basement of Chen Gang's villa, and it should be known what role he played.

At this moment, there is a breakthrough.

In the hospital, patients who received kidney transplants poured beans in bamboo tubes and said everything.

"Five million, they say I don't have a match now, if I want to have surgery as soon as possible, I have to pay for it!"

"Where was the surgery done?"

"I don't know, I was anesthetized at the time, and I didn't know anything."

In the interrogation room, the doctor who operated the knife turned as pale as paper: "I ...... I'm only in charge of the surgery...... Other...... I...... I'm really not involved, really! ”

The interrogation work was in full swing, and the arrest work was non-stop.

It is a covert criminal organization that currently involves a total of eight people.

Doctors at Binzhou First Hospital are responsible for connecting patients and then handing over the matching needs to Chen Gang.

Chen Gang instructed Wang Manli to compare the blood information of all the physical examination personnel at the Qingsong Physical Examination Center.

After finding the receptor that meets the matching needs, let the other party be fooled through erotic lure, and Chen Gang is responsible for making the other party disappear.

Wang Liang was responsible for setting up a shell company, defrauding the hospital's supervision, and using donations and other methods to meet the needs of patients.

There are also four people, all from Binzhou First People's Hospital.

Including a security guard, two nurses and an ambulance driver.

Together, the four of them can get a person out of the underground garage of the hospital, and they don't know it.

Early the next morning, all known suspects were arrested.

Lu Chuan did not compare the fingerprints in the system, and the fingerprints collected on the nurse and the ambulance driver were successfully compared.

"Ding!"

"Advanced task completed: the host successfully participated in the provincial department task force, extracted fingerprint information on the operating table, became the key clue to arrest the suspect, completed the on-site investigation of the vehicle involved, fixed the suspect's criminal evidence, and successfully provided technical support for the case detection."

"Mission reward: An intermediate skill card, please choose the type of reward by yourself."

Wow......

In his mind, the system reward interface opened again, and dense skill options appeared in Lu Chuan's consciousness.

"Intermediate Spot Survey Skills!"

This time, Lu Chuan did not hesitate and directly chose an intermediate skill under the Criminal Investigation Technique.

Survey!

As a criminal police officer on the spot, Lu Chuan has the ability to detect traces the most.

Intermediate Footprint Identification Analysis, Advanced Fingerprint Identification Analysis, Intermediate Bone Analysis, and Intermediate Tire Trace Analysis.

However, in the direction of the field survey, Lu Chuan only has a primary field survey and photo in his hand, and an intermediate fingerprint collection skill.

This time, when he was doing the basement of Chen Gang's villa and doing a spot survey of the BMW car, Lu Chuan clearly discovered his shortcomings.

When it comes to on-site investigation and photography, there is no problem, although the primary on-site investigation and photography are not very brilliant, but it is comparable to the ability of the general criminal investigation detachment to take pictures.

When it comes to fingerprint collection, Lu Chuan is even more fearless.

The intermediate fingerprint collection skills make Lu Chuan's ability in this area much higher than that of his colleagues.

Wang Hao did not collect the fingerprints on the operating table.

But others, such as buttoning things in the cracks of the floor tiles, Lu Chuansheng is thinking carefully, and he has not yet reached the age of treating work as work.

But in terms of technique and professionalism, there is a gap with Wang Hao.

In the current survey of the BMW car, in addition to the extraction of tire traces, Lu Chuan showed a very high professional quality, and at other times, he was basically stealing the teacher.

Now, with the intermediate field survey skills in hand, Lu Chuan breathed a sigh of relief.