When Lu Chuan moved the corpse with Shen Yan earlier, Shen Yan noticed that the corpse had started to thaw and soften.

However, it was still some distance from being ready for dissection.

Autopsies must follow strict protocols.

Contrary to what some might imagine, performing an autopsy isn't just about cutting open wherever you think there might be a problem.

The procedure must follow a specific order.

Starting with an examination of external injuries on the body, filling out an autopsy report is required.

It's somewhat akin to a customized toolkit, from the incision location, order of dissection, to toxicology and pathology tests, systematically from top to bottom, from outside in.

Although Lu Chuan isn't a forensic doctor, he is familiar with some basic knowledge of autopsy.

After he and Shen Yan restored the body to a supine position, Lu Chuan and Shen Yan left together.

Today, the majority of the work focused on canvassing the crime scene.

Confirming the deceased's identity is of utmost urgency.

Sun Jun and others from Action Group 1 were responsible for following up at the scene, while Group 2 had another robbery case to handle, leaving them extremely busy, so Zhang Hui had to take a deputy officer along to sort through surveillance videos.

Near the Qinghe amusement park construction site, there are only some old residential areas, which had rudimentary surveillance infrastructure that was mostly dismantled during the amusement park's construction.

Within the inspectable range, only the surveillance at the main entrance of the construction site was functioning.

However, it was clear that the killer did not carry the body through the main entrance, and surveillance yielded almost nothing.

After completing trace evidence collection, Lu Chuan had more tasks to follow up on.

All evidence found within a kilometer around the crime scene, especially inside and outside the wall, was brought back.

This included, but was not limited to, water bottles, cigarette packs, cigarette butts, lighters, yogurt bottles, plastic bags, tissues, etc.

Even though it's unlikely all these items were left by the perpetrator, it is possible some of them were.

Maybe they weren't left during the late-night disposal of the body, but the choice of dumping ground suggested familiarity with the Qinghe amusement park construction site.

If familiar, they might have visited more than once.

What Lu Chuan is doing now is collecting fingerprints and DNA samples from all collected evidence.

In terms of fingerprint collection, Lu Chuan is quite confident; employing different methods for different samples, mastering intermediate Fingerprint Collection Skills, he made it seem effortless.

DNA sampling was a bit trickier.

Typically, DNA sampling involves methods like bloodstain sampling, hair sampling, nail sampling, cigarette butt sampling, oral swab sampling, toothbrush sampling, semen stain sampling, and gum sampling, etc.

Each sampling technique has specific requirements.

On TV shows where someone casually swabs with a cotton swab to extract DNA information mostly portray inaccurate methods.

For instance, successful hair DNA information collection generally requires at least five hairs with clear follicles.

Moreover, freshly plucked hair should be left to dry on clean white paper for a few minutes before being bagged.

Cut or broken hair is unusable.

Similarly, oral swab sampling requires the individual to rinse with water to ensure no food residue remains in the mouth.

Following this, medical swabs must be rubbed strong against both buccal sides in the oral cavity at least 30 times.

Subsequent steps involve drying the swab in a clean space, not using sun, a blower, or air-drying.

Finally, using the same method to gather at least three swabs ensures a successful DNA information test.

Therefore, very few items found around the site will yield DNA information.

Lu Chuan carefully organized each item, methodically inspecting, drying, and sealing them as necessary.

With a hundred evidence bags to go through, Lu Chuan would be busy all night.

Luckily, there's ample staff in the Crime Scene Investigation office; while Lu Chuan sorted evidence, Yang Sen began preparing the samples Lu Chuan collected for laboratory analysis.

Old Bai wasn't idle either; he continued to catalog and document processed evidence to establish case material records.

This illustrates the complexity of homicides, demanding every detail follow the strictest standards and procedures, missing no steps.

Even a seemingly trivial screw, if found at the homicide scene, cannot be overlooked and must be carefully considered before concluded, until the case is resolved.

Of course, not every homicide gets solved; if they become cold cases, sometimes they are reexamined every couple of years until solved.

If not solved... it's repeated.

Endlessly recurring, persistently devoted, linked in fate, inseparable until resolved.

Time: 11:16 PM

"Brother Yang, you can head back. There isn't much left, I can handle it."

Yang Sen has a son preparing for college entrance exams, while Old Bai is quite senior and not suited for late nights, prompting Lu Chuan to assume responsibility.

Yang Sen, checking the time, stretched his back, exhaled, and nonchalantly grabbed two soft cigarettes from the table, one for himself, one for Old Bai.

He didn't offer one to Lu Chuan, having observed often enough that Lu Chuan merely held lit cigarettes.

Occasionally taking a puff, but not inhaling into the lungs, merely circulating it orally.

As an experienced smoker, Yang Sen could judge without seeing the smoke whether it had entered one's lungs, regardless of its pale blue or light gray color.

Old Bai received his cigarette: "Can you manage alone?"

"No problem, just a few more items to process, another hour or two should wrap it up."

After a brief chat, Yang Sen and Old Bai left first.

Liu Guodong was still in the first-floor meeting room, yet to return, and Lu Chuan sighed, knowing the case was progressing poorly.

After an entire day, the identity of the deceased remained unidentified.

Fingerprint comparisons returned nothing; DNA data comparisons yielded nothing; missing persons checks remained without results.

Not long after they left, Liu Guodong entered the lab, visibly exhausted.

"Did Old Bai and the others leave?"

Lu Chuan nodded, handing Liu Guodong a cup of tea: "They just left; there isn't much left, only an hour more at most, and results will be ready by tomorrow morning."

Liu Guodong nodded: "You should head out soon; I'll take over here."

"Master, you head back instead. I have nothing to do at home. I'll sleep in the office tonight."

Liu Guodong shook his head: "I'm not going back either; my wife and kids are asleep now. Going back would wake them up."

After chatting for a while, Lu Chuan completed his work.

All 126 pieces of evidence had been processed for fingerprints and DNA samples.

The remaining task is to carry out analyses and comparisons.

However, this work certainly won't be completed tonight, both tasks need advancement tomorrow.

Liu Guodong lay on the sofa while Lu Chuan set up a camp bed.

The Criminal Investigation Team had accommodations, but mostly allocated to bachelors, with only two or three emergency rooms, reserved mainly for leaders.

Boom! Boom! Boom!

Lu Chuan and Liu Guodong awoke to the sound of banging on the door.

It was Zhang Hui banging on the door.

"Brother Hui, what's wrong?"

Groggy, Lu Chuan glanced at the time; it was not yet 6:30 AM.

The two had only gone to sleep after 2 AM the previous night, resting a little over four hours; Liu Guodong, too old for late nights, had eyes bloodshot with fatigue.

The expression on Zhang Hui's face as he burst through the door was extremely grave: "Something else happened!"

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