The identity of the deceased cannot be determined, making it impossible to advance the case by investigating the deceased's interpersonal relationships.

Moreover, the murderer abandoned the naked body, clearly not wanting the identity of the deceased to be exposed through clothing and other information.

As for items like identity cards and mobile phones, they must have been hidden or destroyed by the murderer long ago.

In this regard, the murderer's actions are very cautious, and the results are evidently successful.

Lu Chuan thought for a moment and looked at Yang Sen and Old Bai, "Brother Yang, they collected some footprints outside the wall. I want to try analyzing them first."

"Also, regarding the process of the murderer tossing the body over the wall into Qinghe Amusement Park, I think some data analysis could be done."

Footprint analysis, Liu Guodong knew, was something Lu Chuan was also proficient in.

However, the footprints collected this time were very unclear and overlapped with multiple prints.

Furthermore, according to the preliminary inquiry around the crime scene by Zhang Hui and his team, the time of abandoning the body should be between eleven o'clock last night and six o'clock this morning.

Because Zhang Fugui's last patrol of the grounds every day is at eleven o'clock at night.

According to Zhang Fugui, during his nightly patrol, he uses a strong flashlight to check all the places and corners he can't reach personally.

The location where the body was lying, Zhang Fugui was very sure he did not discover it during his patrol at eleven o'clock last night.

This confirms that the earliest time the murderer abandoned the body was eleven o'clock last night.

As for the early morning time, it is because around six o'clock in the morning, when the sky hasn't yet brightened, there are already elderly people walking in the small park.

If the perpetrator abandoned the body during this period, it would be easily discovered.

Combining this with the fact that the body was scratched against the wall and bled out, then froze and stiffened, the time of body abandonment was definitely after eleven o'clock last night and before six o'clock this morning.

When Lu Chuan and others arrived at the scene, it was already ten o'clock in the morning.

The small road outside the wall had already been walked over by many exercising people.

Even if the murderer left footprints, after being trampled by many, it would be difficult for Lu Chuan to analyze the result.

"Footprints... let's try first."

Liu Guodong was obviously aware of the difficulty here: "What do you mean by data analysis?"

"Here's the thing," Lu Chuan opened his crime scene investigation notes just recorded: "The height of the construction site's enclosure at Qinghe Amusement Park is two meters."

"The deceased is about 1.63 meters tall and weighs about 55 kilograms."

"The murderer wanted to hoist such a body over the wall, so it can first be confirmed that the murderer is quite strong."

"Moreover, the height of the murderer's arms stretched upward must at least exceed the wall, which means a height of two meters and twenty centimeters."

Lu Chuan had already carefully measured the specific height of the wall at the scene.

Lu Chuan gestured by stretching out his arms: "The length of a normal person's arm when raised is about forty centimeters above the head."

"In this case, the height of the murderer is at least about 1.8 meters."

"With a height of 1.8 meters and good physical strength, the gender of the murderer can basically be locked in as male."

"Additionally, I want to do a microtrace evidence collection on the body."

Microtrace evidence collection?

"Can you handle it?"

The reason Liu Guodong raised this question is that collecting microtrace evidence is not easy.

Microtrace evidence refers to extremely small criminal evidence.

Theoretically, any mutual contact between two objects will leave some traces.

For example, clothing brushing against pollen or palms touching paint would leave obvious contact traces.

Some contacts, however, leave very inconspicuous traces, like a magnet touching an iron block, which, when separated, shows no visible traces, but the magnet definitely has the molecular structure from the iron block.

It's just that because the molecules are too small, they are invisible to the human eye, and even with specialized magnifying instruments, they can't be distinguished.

But the contact definitely exists.

The quantity level of microtrace evidence in forensic identification is significantly larger than that of molecular levels.

Common microtrace evidence includes pollen, hair, skin flakes, fibers, cosmetics, and so on.

Microtrace evidence is not only difficult to collect but even harder to analyze and identify.

Lu Chuan has specialized skill cards for the identification and analysis of microtrace evidence provided by his system.

Unlike the typical detection and analysis of physical evidence, the identification and analysis methods for microtrace evidence are different, and so are the instruments used.

The Criminal Investigation Team of Haizhou City is incapable of doing identification and analysis of microtrace evidence on its own.

In fact, even the technical identification center of Haizhou City's Public Security Bureau lacks the personnel and equipment for this.

Only the capital city Public Security Bureau and the Provincial Office's technical identification center have microtrace evidence identification laboratories.

This means that once Lu Chuan successfully collects it, the collected microtrace evidence would need to be sent to the Provincial Office for testing.

"There's not much issue with the collection, it's just in terms of identification and analysis that Captain Qin would need to apply to the Provincial Office."

Lu Chuan has intermediate crime scene investigation skills, so conducting basic microtrace evidence collection poses no problem.

"Alright, you first do the footprint analysis, see if you can get any results, and for the microtrace evidence... I'll go consult Captain Qin."

After Liu Guodong left, Yang Sen and Old Bai came over.

"Lu, have you learned microtrace evidence?"

Both Yang Sen and Old Bai were first-line detectives before turning to crime scene investigation.

The methods they use are mostly old school, traditional techniques.

Microtrace evidence, a technology possible for collection, identification, and analysis only in recent years due to improvements in technical level, was something they were not quite skilled at.

However, they had heard about it and even undergone some training in this area, though with mediocre results.

Lu Chuan nodded, "I've studied some, there's no other way now, so let's try and treat it as experience accumulation."

Hmm.

Old Bai nodded affirmatively, "In our line of work, just like a forensic doctor, the more crime scenes you've experienced, the more bodies you've dissected, the more knowledgeable you become."

Yang Sen fully agreed with this.

Why don't local police stations and even district and county Criminal Investigation Teams have dedicated CSI officers?

Is it because they can't afford them? Of course not.

The reason local criminal investigation teams or police stations don't have dedicated CSI officers is because there aren't enough cases to train them.

Just like Haizhou City's Criminal Investigation Team, without dedicated trace examination officers, not because they can't afford them, but because Liu Guodong and a few others are sufficient.

The Tianzhou City Criminal Investigation Team has dedicated CSI officers and dedicated trace examiners because Tianzhou City has a larger population, more cases, sufficient work to "train" dedicated CSI and trace examiners.

"This time, the two of us will assist you and learn about this microtrace evidence."

In their positions, they must do their part.

Even though Old Bai is retiring in a year, he holds a high level of ideological awareness and doesn't want to miss the chance to improve his professional skills.

In the gap while waiting for Liu Guodong to return, Lu Chuan hastily analyzed the footprints collected by Yang Sen and Old Bai.

However, just as Liu Guodong feared, the footprints were too chaotic, with over a dozen shoe prints overlapping, making them impossible to distinguish.

Lu Chuan invoked some capabilities from the advanced fingerprint identification analysis skills but was to no avail.

Half an hour later, Liu Guodong returned to the crime scene investigation office, "Lu, Captain Qin agreed, he'll make the application to the Provincial Office, and now it's up to you."

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