1995, Starting as a Criminal Investigation Expert

Lin Wanping is of medium build, with a square face and a wide chin.

He had the air of a gangster boss, walking with a swagger. He glanced up and saw the two of them.

"You two."

He waved to the two men, squinted, and asked, "What are you doing here? We've already surveyed the site, haven't we?"

Peng Rong quickly greeted him, then pointed to Li Shu and said, "Team Leader Lin, Li Shu asked to come and take a look at the scene."

Lin Wanping narrowed his eyes again, looked Li Shu up and down, and then said, "I know you. When you first came to the team, that new fingerprint comparison method that Old Han mentioned was something you came up with, right?"

Li Shu nodded quickly.

Lin Wanping had a very strong bandit-like aura, especially when he looked at people and spoke, he liked to squint his eyes, giving people the feeling that he was not someone to mess with.

Li Shu's presence seemed somewhat weak in his presence.

"What do you want to see?" Lin Wanping pressed.

Li Shu didn't hide anything and shared his thoughts.

"Team Leader Lin, I'll just take a quick look at the scene. After all, I just arrived and I wasn't there when the site was being surveyed," Li Shu explained.

Lin Wanping nodded thoughtfully, then suddenly stepped forward and hooked his arm around Li Shu's shoulder.

"Director Li, you go ahead with your work, we'll go upstairs and take another look."

He greeted a middle-aged man who was with him, and then hooked his arm around Li Shu as they walked upstairs.

Another member of the large team who was traveling with him, Peng Rong, immediately followed.

Lin Wanping only released Li Shu when they reached the top of the stairs, but he still leaned close and asked, "Are you saying that this half fingerprint can also be matched? I remember your Captain Han said that this half fingerprint has no value for comparison."

Li Shu felt a little awkward, took a half step to the side, and said, "Captain Lin, this is just my personal idea. I just wanted to give it a try. It might not work."

Judging from his tone, he seemed to care a lot.

Li Shu couldn't agree to anything.

Upon hearing this, Lin Wanping understood and didn't ask any further questions.

This is a four-story office building, and the crime scene was on the second floor.

Come up the middle staircase, turn right and walk inside. The third door leads to the finance office.

The survey report mentioned that there was a chain lock that had been pried open at the main entrance of the ground floor hall.

The administration building runs east-west, and the factory's outer wall is less than 50 meters to the south.

It is speculated that the suspect climbed over the wall, picked the lock, and went up to the second-floor finance office.

Arriving at the door.

The door was tightly closed and sealed with tape.

There should still be traces in the corridor, which is the scene of Zhang Ruiping's death.

However, it has long been cleaned up now.

Lin Wanping casually lit a cigarette, leaned against the wall, and watched Li Shu busy himself.

I didn't bring shoe covers or anything when I came.

But it doesn't matter.

After the incident, the scene was investigated three times, and all the physical evidence that could be found was collected.

So you can go in now.

Because this was the finance office, with a large number of documents, and it was necessary for work, the factory moved most of them away after the site inspection.

In addition to the physical evidence that was taken away, the interior of the house appeared empty when the door was opened, compared to the photos taken at the scene.

Li Shu first squatted down and glanced at the door.

It's just a very ordinary wooden door.

There were no signs of forced entry, suggesting the suspect picked the lock using skill.

They entered the scene cautiously.

Li Shu tried to reconstruct the scene by comparing the photos in his memory.

There were signs of ransacking; drawers and other things had been opened.

On the way here, Li Shu asked Peng Rong about it.

He attended the case analysis meeting, so he knew the situation at the beginning.

At the time, the team analyzed the situation and concluded that the other party had not scouted the location beforehand, but had a clear purpose and went straight to the finance office after climbing over the wall.

Two reasons.

Firstly, there were numerous signs of disturbance at the scene. If someone had scouted the location beforehand or had an inside contact, they should have known where the money was stored.

Secondly, the perpetrator only stole a little over 8,000 yuan in cash this time.

In fact, as a foreign-invested enterprise, the finance department handles a considerable amount of payments every day.

However, if there is a large amount of cash, the factory will not put it in the safe in the finance office, but will deposit it in the nearby Bank of Communications before leaving get off work.

This means the suspect missed his target this time.

If they had scouted the location beforehand, they should have known about this situation.

Peng Rong patted Li Shu on the shoulder and pointed to the lower shelf of a wooden filing cabinet deep inside, saying, "This is where the safe is, and as for the trophy, we asked around, and it's in the display case over here."

He pointed to another row of cabinets across the street.

"Then it fell to this spot."

He pointed to a spot at his feet, next to a desk.

The cash of over eight thousand yuan was a small sum, and the finance department stored it in a safe after get off work.

The cabinet outside is locked.

It was locked securely.

The suspect broke into the safe and stole the cash.

The safe has been towed away and stored at the Municipal Bureau.

It's a Jingzhong brand safe manufactured in Matsuura.

The opponent didn't rely on technique; they relied on listening, feeling, and skill to open up the game.

The other party brought an angle grinder, plugged it into the socket on site, and cut open the lock tongue directly.

The methods used were undeniably brutal.

Another security guard who was seriously shot said that they heard a slight noise while on patrol and rushed over to investigate.

That must be the sound of an angle grinder cutting.

The fingerprints were found on the inside of the cabinet door.

Li Shu squatted down and felt around. Since it was an index finger, he felt that it must have been cut open before he opened the cabinet door.

My index finger was hooked on the inside, and then the angle grinder might have been greasy.

A physical and chemical test was performed on the fingerprints, and the analysis revealed oil stains.

So a fingerprint was left on the inside.

Then there should be one on the outside of the cabinet door, otherwise it would be inconvenient to open the door with one finger.

Or, to put it another way, two fingers were used on the inside, the index and middle fingers, but the middle finger applied too little pressure and left no fingerprint.

Since there were no fingerprints on the outer side, Li Shu could make a reasonable deduction.

The suspect must have cleaned up the scene when he left.

This is also the main reason why, despite such a detailed on-site investigation, no fingerprints were found on the door or drawers.

"Why don't they wear gloves?" Li Shu asked rhetorically.

Wearing cotton gloves is enough to prevent any fingerprints from being left.

A serial offender should be a seasoned criminal.

Peng Rong said, "It's inconvenient to work, and as you've seen, they're conscious of cleaning up the site, so wearing gloves or not doesn't make a difference."

Li Shu nodded.

The fingerprint on the inside of the safe must have been forgotten during cleaning.

So it's likely that he was too panicked after shooting the security guard and overlooked this detail.

Li Shu got up and went to his desk.

Photos from the scene show the trophy lying on the ground.

I asked the factory staff, and they said there are other trophies and certificates in the display case.

The suspect only touched the cup-shaped bronze trophy, and Li Shu thought of a reason.

Could it be that the suspect thought the thing was gold, which is why he took it out to check?

Then I realized it wasn't gold, so I just threw it away.

The trophy has handles, and the half fingerprint was extracted from the inner surface of one of the handle support arms.

Li Shu tried to demonstrate.

If you're holding it by the handle, place your four fingers on the inside of the cup.

It's possible for your fingers to land right on the support arm of your ear.

When wiping, I wiped the inside, but only wiped away the fingerprints of the other three fingers on the flat surface, while the fingerprints on the raised support arm remained.

But there is another possibility.

Li Shu felt it was more like the thumb was holding the ear, with the other fingers outside, lifting it up.

In my haste to wipe, I only thought of wiping the outside and thus neglected the inside.

For this half of the fingerprint, the support arm is only one centimeter wide.

In addition, the fingers were dirty, so Han Jianjun and his team couldn't figure out which finger it was.

Li Shu was unsure whether his speculation was correct.

But after arriving at the site and conducting an on-site inspection, it really felt like a thumb.

Just then, someone called me from behind.

It is Lin Wanping.

He leaned against the doorframe, gestured with his chin towards Li Shu, and said, "Kid, what are you researching? Tell me about it."

Li Shu shook his head, saying he hadn't found anything.

The speculation that the half fingerprint is a thumbprint would be helpful, but it's still a long way from deciphering it and matching it.

Upon hearing this, Lin Wanping subtly rolled his eyes, muttered a soft "hmph," patted the doorframe, and squinted, saying, "Alright, go back and get back to work."

After saying this, he called to his men and turned to leave.

Li Shu was taken aback and asked Peng Rong beside him, "Senior brother, does he look down on me?"

The tone was as if to say, "You're just a technical police officer, what are you meddling in?"

What do you think?

Peng Rong gave a wry smile, patted Li Shu on the shoulder, and told Li Shu to leave.