1995, Starting as a Criminal Investigation Expert

They were having a lively conversation in the darkroom.

Xu Qiang and the others outside the door were so anxious they wanted to rush in.

After a long while, the door finally opened.

A group of people swarmed around them in an instant.

Han Jianjun stumbled from the impact, looked at the expectant faces, and said irritably, "It's already dark, can't you all go do your own things?"

It's ridiculous that criminal police officers don't go out to investigate and find clues, but instead spend all their time guarding the technical team.

Xu Qiang, thick-skinned as ever, laughed and said, "I'm just doing something important."

He quickly asked if it was okay.

Han Jianjun snorted and retorted, "What do you think?"

Why call someone back from so far away, only to miss the victory celebration dinner?

Xu Qiang's eyes lit up, and he hurriedly said to Xiao Rui and the others, "I told you, it has to be Li Shu, that kid is really good."

Shao Guiying chimed in, "Old Xu, what kind of kid is this, calling himself an expert?"

With this level of skill, what else could they be but experts?

Xu Qiang nodded hurriedly, pointing at everyone and saying, "Remember, from now on, when you meet me, call each of you an expert."

"Get lost!"

Seeing that everyone was talking more and more outrageous, Han Jianjun impatiently chased them away.

He took the paraffin oil and returned.

The first step is to solve the problem of dark-colored carriers.

The second step is to address the rough, pockmarked surface.

The method involves applying a grease such as paraffin oil to the substrate, smoothing out the rough surface as much as possible to eliminate diffuse reflection of light and thus meet the shooting conditions.

Under the light source, Wei Dejun quickly completed the photo taking.

"Not bad, quite clear." Wei Dejun said hurriedly after looking at the negative.

The experiment was a success.

After looking at the negatives, Han Jianjun no longer hesitated and said one word: "Get it."

The same process.

Inside the dark room, three semi-glowing fingerprints were indeed visible on the inside of the doorknob.

"I told you, there were definitely fingerprints." Zhao Yong slapped his thigh excitedly.

Xu Qiang and his team conducted an on-site analysis.

The suspect was sitting in the back seat. Initially, he must have taken the weapon from behind and restrained Liu Yanjuan, forcing her to hand over money.

It's unclear what happened in between, but Liu Yanjuan likely hit the suspect with a water glass.

For example, you might reach for money with your right hand and secretly take a water bottle from the car door's storage compartment with your left.

When asked, she said she had a water cup with a metal casing, but it wasn't found at the scene.

It is estimated that this incident injured the suspect and also angered him.

Judging from the stab wounds observed during the autopsy, the suspect most likely grabbed Liu Yanjuan from behind, using his left arm to strangle her and restrain her in the car seat, while simultaneously stabbing her five times with a knife in his right hand.

The suspect had blood on his hands, then took money and a water cup, and possibly used clothing or other items to quickly wipe away the traces left by his fingers.

The door handles are embedded inside the car door.

It's a blind spot that's easily overlooked when people are in a tense state, because when wiping, they tend to wipe the outside as well.

Therefore, Zhao Yongcai analyzed that there is a high probability that there are latent blood fingerprints inside.

Once the fingerprints have been extracted, the next step is comparison.

Tang Weidong also arrived along the way.

First praise Li Shu, then talk about his hard work, and only then ask about the result.

"What, it didn't match?"

He noticed that the atmosphere was somewhat heavy.

Li Shu didn't reply. He sat in front of the computer, wondering if the pressure applied would cause his fingerprints to deform.

Han Jianjun sighed softly and nodded slightly.

A total of three and a half fingerprints were extracted, the other half being the little finger.

It should be that when opening the door, the force applied is not very strong, so it is at its shallowest.

The clearest are the index and middle fingers.

However, after comparison, no match was found.

Tang Weidong glanced at the time; it was almost 11 p.m.

He quickly adjusted his mindset.

"Alright."

He stopped Li Shu and said with relief, "Don't be discouraged. At least we've extracted the fingerprints. If we find a suspect later, that will be irrefutable evidence."

"It's getting late, Li Shu. You've taken both a plane and a train, so hurry up and go back to get some rest. We can talk about any problems tomorrow."

At that moment, he urged Li Shu to go back and rest.

He also specifically instructed Tan Guoxiong to take good care of Li Shu.

Stop overthinking. Only when we're well-rested can we figure out a way to catch this bastard.

That's what they say, but how could Li Shu not think about it?

It's so frustrating when the fingerprints you painstakingly extracted don't match.

"If we had a fingerprint database, with all the fingerprints of people across the country in it, wouldn't that be so convenient?" Li Shu said, lying in bed.

If the killer is from within China, the chances of finding him are practically guaranteed.

Tan Guoxiong, lying on the opposite bed, was startled and said, "How is that possible? That would cost a fortune."

There are over a billion people.

Then he stood up and said, "Alright, Li Shu, stop thinking about it. You've already done a great job by extracting the fingerprints today. It would be best if they match, but if they don't, like Captain Han said, we'll send them to other cities for comparison."

"And just like the case you solved in Matsuura, as long as the suspect is alive, we'll catch him sooner or later."

Li Shu nodded slightly, without telling Tan Guoxiong that in the future, around 2012, a nationwide networked fingerprint database was established in China.

You can compare fingerprints from all over the country without leaving your home.

The next morning, the detachment held another meeting to summarize the progress of the investigation from all aspects.

Progress is not going well.

Tang Weidong lost his temper again, roaring that the technical team had gone to great lengths to extract the fingerprints, but you guys hadn't found a single thing.

It's a fair assessment of the hard work of the technical team.

Xu Qiang wanted to argue that he had made some discoveries, but he didn't dare.

There was nothing he could do.

It was late at night in the suburbs, and there wasn't a soul in sight. A suspect appeared out of nowhere, killed someone, and ran away.

Even the legendary detective from the East would have a headache with this kind of case.

As always, Li Shu sat down at the table, silently flipping through the files, pondering how to compare fingerprints.

Xu Qiang analyzed it for himself yesterday.

They said this person either had no criminal record or had moved here illegally.

Last night, Li Shu thought that if the person was from another province, he should send him to Songpu first, since the person had fingerprint records from eight nearby provinces dating back to before 81.

Those who travel around usually have a criminal record.

However, a new finding has emerged today that refutes this possibility.

Liu Yanjuan is a kind and outgoing person in her daily life. She never gets angry with anyone and is always willing to help others in return. She's the same way in the taxi company; after driving taxis for several years, many drivers know her.

After she was killed, many drivers offered to help inquire about the situation.

I actually found out some information.

It is said that on the night of the incident on the 12th, a driver of an unlicensed taxi waiting for fares at Madun Bridge may have encountered this suspect.

Because the other party had asked him if he wanted to go to the plum garden.

He thought it was too far and didn't go.

But the place this person was going to was exactly where Liu Yanjuan was murdered.

Madun Bridge is a frequent destination for taxis in the city, so this person is likely the suspect.

We found the unlicensed taxi driver, but unfortunately...

The other person asked casually, and was wearing a black cloth mask, so the unlicensed taxi driver couldn't see their face clearly.

But one thing was confirmed: this person spoke with a local Nanjiang accent.

The suspect is likely a local resident.

This fits the first scenario Xu Qiang described even better, which is an inexperienced novice doing this for the first time.

In this situation, sending the fingerprints to other provinces or cities would be useless.

As he flipped through the pages, Li Shu suddenly noticed something.

"Director Qin, what is this?"

Li Shu switched places with Wei Dejun, took the autopsy report, and asked Qin Wenbao questions.

It's a photograph.

The photos show three circular indentations on Liu Yanjuan's right breast.

Very strange.

"This one?"

Qin Wenbao glanced at it and said in a low voice, "It should have been caught. The autopsy was done on the 13th. We didn't find it at the time. After the autopsy, it was frozen. We only found these three finger imprints when we checked it again yesterday."

"You should know that some marks will appear after freezing. I speculate that they were left by the suspect. He may have reached into the victim's collar and grabbed her while he was controlling her from behind."

Qin Wenbao gestured.

If you want to subdue a suspect from behind, your left hand is conveniently at your disposal.

Li Shu responded with an "oh," and perked up.

In mid-October, although the temperature had already dropped, it was still high at noon.

Moreover, the air conditioning is usually not turned on in the car this month, as it's stuffy and hot.

Therefore, on the day of the incident, Liu Yanjuan was wearing a short-sleeved shirt with a printed pattern on the chest, a low-cut round neck, and a relatively tight fit, along with white arm sleeves, which was appropriate for the weather.

However, she has a large bust.

"Li Shu".

Just as I was thinking about it, someone suddenly called my name.

It was Tang Weidong who noticed Li Shu changing seats and talking to Qin Wenbao, and asked Li Shu if he had anything to say.

"It's nothing."

Li Shu quickly shook his head.

Lin Wanping, on the other hand, perked up and urged with a smile, "Don't hold back, tell me what you're thinking."

Li Shu had mentioned this idea before, and it actually helped solve the case.

Li Shu shook his head again, surprised.

However, as everyone started talking and thinking, the name Madun Bridge suddenly popped into their minds.

In an instant, it suddenly connected.

Just to give you an example, the area around Madunqiao is full of hair salons.

The suspect got on the bus here, and during the robbery, under those circumstances, he also assaulted the victim by touching her unnecessarily.

The victim wasn't even considered pretty.

From a criminal psychology perspective, Li Shu felt that this person seemed very impatient and repressed.

Also, if he steals money, will he spend it?

Thinking of this, Li Shu looked up and said, "Director Tang, how about we crack down on prostitution?"