1995, Starting as a Criminal Investigation Expert

In the conference room on the third floor.

Li Sheng entered the room dejectedly.

Wei Dejun and his friends huddled together smoking, shouting, "Li Sheng, are you sure you're clean?"

Li Sheng's expression changed, and he hurriedly raised his hand: "I swear to God, it's completely clean. And I even soaked it in disinfectant, I guarantee not a single bacteria will remain."

Wu Sixin from the physics and chemistry group chuckled and said, "Li Sheng, as we chemists know, there's no such thing as absolutely clean. Do you understand what it means to have microscopic residues at the molecular level?"

Li Sheng, who was about to sit down, froze.

A colleague from the photography crew nearby interrupted, saying, "Old Wu, don't scare Li Sheng. I think it's fine. Have you guys read Yilin magazine? Someone wrote about how five-star hotels clean toilets so thoroughly that you can drink the water afterward. Isn't that the same principle?"

Li Sheng nodded hurriedly like a chick pecking at rice, and vowed that he would wash himself absolutely clean.

The physics and chemistry group still shook their heads.

One person said, "It's at the molecular level. Let me give you an example. Take farting, for instance. Theoretically speaking, when you smell a fart, it's like you've eaten shit."

He Meiling and her group of office staff were also there, eating sunflower seeds together. Upon hearing this, they disgustedly threw sunflower seeds at him.

Just as they were joking around, Han Jianjun and Cao Junfei pushed open the door and entered.

Qin Wenbao was following behind.

Han Jianjun's expression was not good. Seeing someone laughing happily, he glared at them and said, "What are you laughing at? Do you think you're all out of the woods? Director Tang said this is a problem with procedures and management systems. Every single one of you needs to reflect on this."

After these words were spoken, everyone became a little more obedient.

Han Jianjun sat down for the meeting.

The first thing they did was criticize Qin Wenbao and the other two forensic doctors.

The day before yesterday afternoon, Li Shu and his group discovered meat stored in the freezer.

Li Sheng was stunned, because he knew that it was the meat from the cafeteria.

The key point is that if Li Shu hadn't come to check the freezer, he wouldn't have remembered that this freezer had been used to preserve corpses.

When the news spread, it disgusted a lot of people.

Tang Weidong and his group, in particular, were cursing the cafeteria while demanding that Xu Qiang and his team investigate the matter thoroughly.

They eat in the cafeteria too!

Xu Qiang and his team took it very seriously.

Others might just have lunch and then cook for themselves when they get off work in the evening.

where are they?

Everyone was so busy they were dizzy, and they practically ate all three meals a day in the cafeteria.

Now I'm telling myself that the meat I ate in the cafeteria was stored in a highly rotten freezer that had been used to store corpses.

He has a terrible temper; he'd love to tear the cafeteria down.

Upon investigation, several reasons were found.

First, the forensic team has their own separate area, located in the northeast corner of the municipal bureau compound.

The cafeteria is also separate.

On the north and west sides of the building is the logistics department area, where the boiler and bathrooms are also located.

To the east, separated by the power distribution room, and not far away is the forensic department.

Therefore, the cafeteria has the practical means to store meat in the forensic warehouse freezer.

Secondly, the incident began in early June.

The transformer near the municipal bureau exploded due to a load problem, causing a major power outage.

It just so happens that the cafeteria's freezer broke down the day before. It could have been repaired in time, and the meat wouldn't have spoiled.

This power outage is a big problem.

Feeling sorry for the wasted meat, the cafeteria staff had a sudden inspiration: the morgue had electricity.

The morgue requires that the cold storage and freezers for storing bodies be kept running year-round, and generators are available in case of power outages.

People came over to take a look and discovered this unused freezer.

Li Sheng was on duty at the time.

It's been a year since Huang Youjun's case, and the freezer has been sitting there. He forgot about it and didn't think much of it, just saying, "Just plug it in and use it."

The cafeteria staff had no idea that the freezer had previously contained a corpse, so they plugged it in and used it.

Once you've done it the first time, you'll do it again.

Qin Wenbao later found out as well.

He's a veteran forensic doctor with decades of experience. He can weigh a brain one minute and eat the next. Why would he care about that?

I figured the freezer had been certified and cleaned, so leaving it lying around would be a waste. If you want to use it, go ahead.

Buying more meat will get you a discount, and since there's a freezer to store it, the cafeteria naturally won't refuse.

So I often froze the extra meat I bought here until it was discovered this time.

"Li Sheng, write a self-criticism."

Han Jianjun glared at Li Sheng, then said, "Just like I said, this is a matter of procedure. So you're just leaving the freezer there and not caring about it?"

It may be disgusting, but it's really nothing.

The main issue is the management of this freezer. Even after the evidence was collected and it was confirmed that it had no further investigative value, the poor management led to its unauthorized use, which is itself non-compliant.

"So Director Tang's instructions are also my idea."

He pointed at everyone and said, "Every single one of you must write a reflection and summary for me, and also offer suggestions. One is not too few, ten is not too many. We must find a way to optimize the process and not allow any more mistakes."

The case file was handled by the archives department, while the physical evidence was handled by the technical team, and Han Jianjun was the person directly responsible.

Upon hearing this, everyone wailed in despair.

In the corner, Li Shu had a sudden thought.

This matter could be a big deal or a small deal.

On a larger scale, this indicates poor management of physical evidence and problems with the system and procedures.

Also, when I went to the evidence room the day before yesterday, some of the sealed bags there were leaking air.

This is also a problem.

The technical team, which studies physical evidence, should at least properly preserve the evidence.

Han Jianjun asked for suggestions to optimize the process.

Li Shu then thought that he might as well take this opportunity to organize the information on physical evidence preservation in the system and form a set of applicable standards.

In some places, efforts are being made to optimize and improve the system based on the actual conditions.

For example, regarding the registration of physical evidence entering the warehouse, Li Shu, who is proficient with computers, felt that it would be perfectly feasible to set up a computer for electronic registration, which would be convenient for querying and less prone to errors.

After Han Jianjun finished speaking, Cao Junfei spoke again.

The meeting only ended after being reiterated repeatedly.

"Li Shu".

Han Jianjun stopped Li Shu and said with a smile that the coating instrument had arrived, and asked Li Shu to come with him to the train station to pick it up.

Li Shu's eyes lit up.

Two days ago, Li Shu visited the crime scene, and yesterday he spent time carefully studying the physical evidence and the data from the system.

Everything is ready, except for the coating machine.

Right then, he called Tan Guoxiong and a few others, drove a truck together, and went to the station to pick up the goods.

It's not small.

They were successfully pulled back, and everyone gathered around to unpack the box.

I've heard Li Shu describe this thing, but I've never actually seen one.

"Do you think it's possible to scrape the gold off after it evaporates?" Peng Rong craned his neck to look inside.

Zhao Yong pushed him aside: "It's not like your salary was used to buy gold, why are you worrying about this?"

Then I asked Li Shu if he wanted to try it now.

Han Jianjun shared the same idea—to broaden their horizons.

Li Shu nodded.

Before actually coating and extracting fingerprints, a test must be conducted to ensure that the evaporation rate of the instrument matches the data in hand.

Peng Rong generously offered his own porcelain drinking cup as a test subject.

Li Shu ignored him and used the soup bowl he had specially bought the night before.

Similar to physical evidence at the scene, this allows for a more accurate assessment of the evaporation time.

The process has improved, the sealing is better, and the vacuuming is much faster than the 803 machine.

The first experiment went very smoothly, and fingerprints were successfully extracted from the bowl.

Han Jianjun took the soup bowl, looked at it over and over, and asked impatiently if it was time to officially extract the soup.

Li Shu shook his head.

I found some discrepancies in the data, so I plan to try it a couple more times and make some adjustments.

Using similar plates, he tried twice more to get the timing right before Li Shu finally brought out three dishes and a soup.

Pen'er had the best chance, so Li Shu put her last.

First, prepare the plates.

Two and a half fingerprints were extracted from two locations on the plate containing the braised pork.

Half a fingerprint is on the bottom, and two fingerprints are on the wall, which should both be the index finger.

The key fingerprint is very faint, and the lines are very blurry.

"Captain Han, this might be Kang Guiying's fingerprints."

Han Jianjun and others were thrilled, but Li Shu poured cold water on their enthusiasm.

As people age, their fingerprints become flat and blurry.

Moreover, elderly people sweat less, so it is most likely Kang Guiying's own sweat.

Han Jianjun remained silent and asked Zhao Yong to pick it up and compare it.

Curry didn't have Kang Guiying's fingerprints, and the body was decomposed, making it impossible to extract fingerprints.

Although the scene had been cleaned, dusty fingerprints of Kang Guiying and Huang Youjun were still found in some nooks and crannies, allowing for comparison.

Then they brought out the remaining two plates.

Both fingerprints were extracted, but the lines were faint, so Li Shu believed they were Kang Guiying's own fingerprints.

"The last one."

Li Shu took a deep breath and placed the porcelain basin into the instrument.

The only concern was that the suspect wouldn't help at all, so Kang Guiying had to serve the dishes herself.

Evaporation, depressurization—amidst everyone's tense gaze, Li Shu opened the door.

A quick glance at it sent a jolt through me.

On the upper side of the porcelain basin, two relatively complete handprints were visible, positioned opposite each other.

"It's a success!"

Zhao Yong exclaimed in surprise.

"Don't rush."

Li Shu quickly took it out.

I'm afraid those two handprints might also be Kang Guiying's own.

But upon closer inspection, Li Shu felt there was hope.

First of all, the handprint is very large, unlike the handprint of an old lady.

He quickly glanced at the fingerprint on his index finger.

Li Shu was certain that it wasn't Kang Guiying's; the lines were more obvious and clearer, and the fingerprints were larger.

That's right, it should be the fingerprints that the suspect overlooked and left behind.