When a murder occurs, the local police will exhaust all resources to solve the case.

Especially considering that seven bodies were encased within the bridge pier.

Li Donglin, from the Second Criminal Investigation Division of the Provincial Department, personally took charge, and everyone from Qinzhou City's Criminal Investigation Team, its subordinate major teams, and police stations were working on this case.

Any clue is followed up on with full effort in the shortest possible time.

Although Lu Chuan was in the rear, he could feel the tension on the front line.

Because in less than three hours, information on the identity of the sixth body was relayed back to the rear.

"Designer?"

The owner of the sixth body was named Wang Xiaobo, an engineering designer.

However, unlike ordinary designers, Wang Xiaobo studied intelligent robots.

"Director Li, they are already investigating. The company Wang Xiaobo worked for, back then, had relatively advanced technology."

Zhang Yuanchao looked at the relevant information and explained it to Lu Chuan during their chat.

Based on current investigation results, this seems to be an ordinary commercial espionage case.

But the company where Wang Xiaobo worked was just a regular civilian company.

According to the data, they only had some sophisticated program designs in drone control.

There might be some confidential aspects since it's commercial secrets.

But to say it warrants taking lives seems unlikely.

Lu Chuan had heard many similar cases in college.

Most commercial espionage cases involve bribery and are usually handled by the Economic Crime Investigation teams.

Few involve murder.

Shaking his head, Lu Chuan continued his work.

There is a division of labor in solving cases, Lu Chuan's battlefield was at the back.

Among the seven skeletons, four people's identities had been confirmed so far.

Investigations surrounding their interpersonal relationships were also progressing rapidly.

Lu Chuan continued performing skeleton identification analysis.

Skeleton Identification Analysis is actually an important branch of human remains identification analysis.

Human remains identification analysis does not necessarily focus solely on deceased individuals.

It also includes injury and disability assessment for living individuals.

"This time, let's primarily discuss gender identification of bones."

While Lu Chuan was operating, Zhang Yuanchao was explaining.

Among the students following Zhang Yuanchao, most had a rich theoretical knowledge base but lacked practical on-site experience as young forensic doctors.

Encountering seven skeletons in one case is not a common occurrence.

Generally speaking, few forensic doctors have the opportunity to accumulate experience in skeleton identification.

Some encounter one case a year, while some even go three to five years without encountering one.

Zhang Yuanchao's studio had two skeletons, but those were donated by a hospital.

The bones had been examined by the forensic doctors to the point of being overly familiar, and due to long periods of touch, significant changes had occurred on the surfaces of the bones.

Unlike now, this was the first scene of the crime.

The skeletons, sealed in a cement pier for fifteen years, were perfect teaching tools.

If the students could thoroughly analyze these skeletons, they would almost be ready to graduate.

With two or three more case experiences, their skills would significantly improve and solidify.

Lu Chuan was currently measuring the pelvic size of a skeleton.

"The shape of the pelvis is the most accurate and important basis for identifying the gender of a skeleton."

"Men have narrow, high pelvises, while women have wide, low ones..."

"Look at the pelvis of this body, is it male or female?"

A few forensic doctors stepped forward, glanced at it, and immediately judged: "Male."

For such basic judgments, Zhang Yuanchao didn't even show interest in affirming them.

Gender differences in pelvic shapes are substantial, so much so that even ordinary people with normal eyesight can distinguish them.

The key is that not all skeleton cases result in complete skeletons.

Moreover, the differences in pelvises are not merely narrow or wide distinctions.

If you only have a small part of the pelvis, how do you determine gender?

"In many skeleton cases, the occurrence of dismemberment cases is higher, so if the discovered remains aren't complete, other methods must be used for identification."

Zhang Yuanchao began examples: "For example, the bone density of a male pelvis is higher, and that of a female is lower."

Bone density is relatively easy to measure. Most criminal investigation teams have instruments for measuring bone density.

Of course, most of the time, there aren't many skeletons available to measure.

These instruments are not idle, many criminal policemen often ask forensic doctors to measure their bone density for free.

This way, during medical examinations, they don't have to do it.

Money saved can be used for other projects.

Recently, the provincial department has introduced a package medical examination across the province, which varies the cost of each person's examination based on their age.

Everyone can freely choose and mix items from the medical examination menu according to their physical condition.

Besides some necessary tests like height, weight, and vision, others are supermarket-style selections.

By skipping a bone density test, one can opt for something else.

"The male pelvic obturator is oval; females' are triangular."

"Males have an inward-turned ischial tuberosity, while females have an outward one."

"The male sacrum is narrow and long; females' short and wide..."

After introducing each part, Zhang Yuanchao would ask Lu Chuan to point out the different locations for everyone to observe.

"Ah, this body is female..."

"Elder Zhang, if the pelvis is not found, can other bones also determine gender?"

Zhang Yuanchao nodded; this can naturally also be judged.

"During school, you should have learned that the most reliable way to determine a skeleton's gender is through the pelvic morphology."

This is determined by the different physiological structures of males and females.

The morphology of a woman's pelvis is the most conducive for childbirth.

While the male pelvic shape facilitates the transmission of force.

"Another part for determining skeleton gender is the skull. Generally, male skulls are more robust, the surface rougher, and the bone density higher."

"But some exceptional women may have masculine features, that is, although women, their appearance leans more masculine."

"Similarly, some exceptional men may have feminine features, a gentle appearance, and a smaller frame, leaning more feminine."

Zhang Yuanchao walked to Lu Chuan's side and picked up the skull of skeleton number seven.

"But, the mandibular angle of a skull is regular; less than 125 degrees indicates a male."

"Additionally, determining gender should also incorporate fragments, vertebrae, sternum, and so forth for a comprehensive judgment."

During teaching, Zhang Yuanchao would scramble the bones and then let the students comprehensively determine the gender of the bone owner based on just a few bones.

Lu Chuan often felt that when solving cases, time always flew by quickly.

In the forensic laboratory, the identification analysis reports for all seven skeletons were already completed.

The teaching activities for the young forensic doctors who followed Zhang Yuanchao had also come to a temporary stop.

And on the frontline, the case investigation had made substantial progress.

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