There are no superior or inferior methods among the four crime scene photography techniques; each has its applicable scenario and advantages.

For example, the central photography method used by Lu Chuan this time is for recording the features of the central objects at the scene and their relationship with adjacent objects and traces.

Its characteristic is the enlargement ratio and sensitivity that can completely restore the situation at the scene.

When comparing tire marks, factors like imprint size and trace color are important for comparison, so using the central photography method is most suitable.

As for detailed photography, it emphasizes the details.

In crime scene photography protocols, only the detailed photography method can detach from the surrounding environment to photograph individual traces and items, reflecting the shape, size, and detailed features of the scene's trace evidence.

The requirements for detailed photography are quite meticulous, requiring the trace and evidence being photographed to remain parallel with the lens and photosensitive film, ensuring that the objects and traces photographed are not distorted.

At the same time, using detailed photography must adhere to the principles of proportional photography to accurately reflect the size, thickness, and length of the traces and evidence being photographed.

For example, the wear pattern of the tire tread, peculiar damage details, these tiny traces are easier to compare and analyze using detailed photography.

With his Basic Crime Scene Photography skills, Lu Chuan managed to proceed smoothly with these tasks, completing an ordinary central photography and detailed photography with ease.

The focus afterward is on the modeling of the tire marks.

In tire trace analysis, comparison not only requires photographs but also fixed models.

Of course, with tight schedules and heavy tasks now, there's no time for model creation, nor is it necessary.

These tasks are only used as evidence with tire traces when solving the case.

Regarding model making, there are relevant skills in Intermediate Tire Trace Identification and Analysis.

This somewhat resembles a dentist's work because it involves dental plaster.

Dental plaster differs from ordinary plaster in that it hardens more quickly after being poured over an object.

Regular dental plaster uses beta model plaster powder, whereas dental stone generally uses alpha plaster powder.

Another kind, ultra-hard dental plaster, utilizes special alpha plaster produced by a liquid-phase method as its raw material.

These three types of dental plaster are sometimes used by forensic doctors and trace examiners, who select different types based on different usage scenarios.

Lu Chuan had never experienced inspecting a vehicle before.

Fortunately, Wang Hao and the others are here, all veterans in crime scene investigation. Performing such an investigation is a breeze for them.

As for the DNA samples taken from the basement yesterday, the comparison has been completed.

The results are not exactly promising, or one might say, not very promising.

DNA information of six people was found, but only one person matched, who is the missing Gao Sheng.

Now, it can almost be confirmed that Gao Sheng has been murdered.

There were no traces of blood inside the BMW; the car was very clean.

However, some hair and skin flakes were found in the trunk.

The DNA analyzer will have to be busy once more.

By the end of the morning, the preliminary work of the crime scene investigation was basically completed, and the corresponding DNA samples were being processed.

There should be results in the afternoon.

Meanwhile, good news finally came from the front line where Li Donglin's primary focus was.

The boss behind Twenty-Nine Biotechnology Co., Ltd, Wang Liang, has finally been located.

He's not in Binzhou City; he's hiding in the provincial capital, and they took direct action there.

Among the three people identified by Lu Chuan through fingerprint analysis, two were already found.

These two people are both in Binzhou City First People's Hospital.

One of them is a patient who just underwent kidney transplant surgery.

The other person is his attending physician.

The patient has been detained in the hospital, and the doctor has already been summoned.

As Li Donglin said, a doctor's fingerprint appearing on the surgical table in Chen Gang's basement, one should know what role he played.

With this, a breakthrough point has been found.

In the hospital, the patient who received a kidney transplant spilled the beans about everything.

"Five million; they said there's no compatible match for me right now, but if I want surgery soon, I'll have to pay!"

"Where was the surgery performed?"

"I don't know; I was anesthetized at the time and knew nothing."

In the interrogation room, the surgeon's face is as pale as paper: "I... I just handle the surgery... the rest... I... I really wasn't involved, honestly!"

The interrogation work is intense, and the arrest operations are unrelenting.

This is a hidden criminal organization involving eight people in total.

The doctors at Binzhou First Hospital were responsible for liaising with patients and then passing on the matching needs to Chen Gang.

Chen Gang directed Wang Manli at Qingsong Medical Examination Center to compare all physical exam blood information.

Upon finding a recipient matching the requirements, they'd lure the person through seduction and make them disappear with Chen Gang's involvement.

Wang Liang's side was responsible for setting up shell companies to trick the hospital's supervision and met the patient's needs through donations and other means.

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

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

Together, the four could discreetly move a person from the hospital's underground garage.

By the next morning, all known suspects were arrested.

Lu Chuan successfully matched the fingerprints collected from the nurses and the ambulance driver to those that hadn't matched in the system before.

"Ding!"

"Advanced task completed: The host successfully participated in the provincial department's task force, provided key clues by extracting fingerprint information from the surgical table, completed forensic analysis on the vehicle involved, secured suspect's incriminating evidence, and successfully provided technical support to solve the case."

"Task reward: One intermediate skill card, please select the reward type yourself, host."

Wow...

In Lu Chuan's mind, the system reward interface opened once again, presenting a myriad of skill options in his consciousness.

"Intermediate Crime Scene Investigation skill!"

This time, Lu Chuan didn't hesitate and directly chose one of the intermediate skills under criminal investigation technology.

Crime Scene Investigation!

As a crime scene detective, most of Lu Chuan's expertise lies in trace examination.

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

However, in the field of crime scene investigation, Lu Chuan only had Basic Crime Scene Photography and Intermediate Fingerprint Collection Skills.

During the investigation at Chen Gang's basement and the BMW, Lu Chuan realized his shortcomings quite clearly.

Regarding crime scene photography, there's no problem; although Basic Crime Scene Photography isn't outstanding, it's on par with the average crime scene detectives in normal criminal investigation teams.

When it comes to fingerprint collection, Lu Chuan is not afraid.

Intermediate Fingerprint Collection Skills put Lu Chuan well above his peers in this aspect.

Wang Hao didn't manage to collect fingerprints from the surgery table.

However, concerning other things, like picking objects from tile crevices, Lu Chuan had the advantage of being meticulous, not yet at the age of treating work as mere work.

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

In the crime scene investigation inside the BMW, aside from the extraction of tire traces where Lu Chuan exhibited quite a high level of professionalism, at other times, he basically learned by clandestine observation.

Now, with the Intermediate Crime Scene Investigation skill in hand, Lu Chuan breathed a satisfied sigh of relief.

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