Rebirth 2014: I, the King of Criminal Investigation

Chapter 265 Perfect assist, well done

Extracting fingerprints is simple.

Modern technology includes a water-soluble, non-toxic fluorescent spray that can make fingerprints appear in a few seconds.

It is worth mentioning that this spray was jointly developed by Songhai Normal University and the University of Bath abroad.

But what is really complicated is fingerprint recognition.

For example, how to determine whether two fingerprints belong to the same person?

This depends on whether the characteristics of the fingerprints are consistent.

If two fingerprints have more than seven similarities and the differences can be reasonably explained, they can be identified as the fingerprints of the same person.

During this process, the basic types and details of fingerprints, such as the bifurcation and breakpoints of ridges, will be carefully observed.

So, when the technical staff said "ten minutes", Yu Dazhang was a little surprised.

Anyone who can complete fingerprint verification in such a short time must be an experienced professional.

The reason why he wanted to confirm the fingerprint was to verify a guess in his mind so that he could proceed to the next step.

The fingerprint identification process went smoothly. Just after five minutes, the technical staff member gave the conclusion:

"The fingerprints on the kitchen knife belong to one person."

Yu Dazhang nodded, then took out a piece of paper from his bag and handed it to him:
"See if the fingerprints belong to this person."

The technical staff member looked at the bright red bloody handprint on the paper, then raised his head and looked at Yu Dazhang, frowning:
"Your method of collecting fingerprints is quite unique."

Yu Dazhang smiled back:
"you flatter me."

Am I praising you? The technical staff glanced at him and took the paper.

This time it was even faster. He gave the answer in less than two minutes:
"The five fingerprints match exactly. He held the kitchen knife with this hand."

Just as I inferred...Yu Dazhang nodded to him, then turned and left the stairwell.

He can now basically confirm that He Tianxin chopped off four of his fingers with a kitchen knife.

The suspect has never been here!
So how did he give orders to He Tianxin?
Do you want to come to the hospital in person and talk to him in person?
No, it's too risky.

The hospital's corridors and halls are covered by surveillance cameras. If he shows up at the hospital, his face will definitely be photographed.

If they had been wearing hoods as they usually do, the medical staff would have called the police long ago.

Attacks on doctors are nothing new these days.

Going to the hospital wearing a hood is not much different from going to a bank, and it will definitely alert the staff.

Process of elimination...

The suspect himself did not come, nor did he ask anyone to pass the message, and He Tianxin did not have a mobile phone.

What other methods are there?
Arriving at the door of the operating room, Yu Dazhang looked at He Tianxin's wife who was sitting in the chair waiting anxiously, and suddenly an idea popped into his mind.

Is it possible that she was the one who spread the word?

As soon as this idea came out, it was like a seed sprouting, quickly occupying Yu Dazhang's thinking space and making his thoughts become active.

Yes, it's her!

If I were a suspect, this would be the most convenient and secretive way... Yu Dazhang walked quickly to her and asked:

"After we left during the day, did anyone call you looking for He Tianxin?"

"How did you know that?" The woman stared at Yu Dazhang in surprise:
"Someone called and said he was a classmate of his from school. He heard that he was sick and called to ask about his condition."

As expected...Yu Dazhang asked again:
"Didn't you ask him how he knew your phone number?"

"No." The woman shook her head.

"He must have found out. My phone number is not a secret number. Many of Lao He's friends know it."

Perfect assist... Yu Dazhang looked at her helplessly:
"Did you let them talk?"

"Yes." He Tianxin's wife said as if it was a matter of course:
"He said he wanted to hear Lao He's voice. It happened that Lao He had just taken the medicine and was in good condition, so I gave him the phone."

Well done!

Yu Dazhang was speechless.

He had already deduced what happened next: the suspect threatened He Tianxin with his family and forced him to self-harm.

He also specially prepared a kitchen knife for He Tianxin and placed the knife on the fifth and a half floor, deliberately making him climb two more floors.

He doesn't have to do things like delivering the kitchen knives himself, there are many ways to find someone to do it for him.

There is no surveillance in the hospital stairwell, and many people come in and out every day, making it very difficult to check.

Even if the person who delivered the knife is finally found, it will be difficult to find the suspect through him.

What a calculation.

At this moment, Yu Dazhang began to understand Ding Feng a little.

The suspect's logical thinking is really meticulous. Every step is well thought out and arranged very thoroughly.

Yu Dazhang then asked He Tianxin’s wife for the phone number used by the suspect.

He knew in his heart that this mobile phone number was most likely an anonymous black card.

It is now 2014, and you can buy this kind of anonymous mobile phone card in any store that sells mobile phone cards.

Even in 2024, ten years later, there will still be such phone cards, but the purchasing channels will be more secretive.

As long as online fraud exists, such phone cards will exist.

This is business.

As long as there is money to be made, someone will do it.

Yu Dazhang then gave the phone number to the local police and asked them to help investigate.

At the same time, they were also assigned the task of checking surveillance and investigating the person who delivered the knife.

Although I know there is little hope, I still have to do what needs to be done.

The investigation may be fruitless, but no clues can be missed. This is the most basic professional quality of a criminal policeman.

The next morning.

Yu Dazhang and Liu Miao were just about to go to the hospital to check on He Tianxin's condition, but before they could leave the house, their cell phone rang.

Is it from the team investigating Han Lianwen?

Yu Dazhang made notes on the phone numbers of these police officers, which is the significance of grouping.

"We found him."

The police officer on the other end of the phone had a heavy voice and sounded not in a good mood.

You should be happy that you have found someone... Of course Yu Dazhang knows who that "he" is referring to.

"Where is he?" Yu Dazhang asked.

"Tin City." The police officer on the other end of the phone answered quickly:
"I'll send you the specific address later."

I can’t bear it anymore... Yu Dazhang couldn’t help but complain in his heart.

Since coming to Province S, he has driven back and forth between several cities countless times, and he feels like his body is about to fall apart.

After calculating the distance, I found that it would take about an hour and a half to drive from my current city to Xicheng.

It's OK, not too far.

Now, more than a hundred kilometers is not a long distance for Da Zhang.

"You have already had contact with Han Lianwen."

Yu Dazhang thought for a moment and said:
"Tell me what you have learned from him first, as detailed as possible."

Before he decided to go to Xicheng, he still had to go to the hospital to see He Tianxin first.

Knowing more new information will help him take more initiative in the subsequent conversation with He Tianxin.

"I did get in touch with him, but I didn't learn any valuable information from him."

The police officer on the other side sounded somewhat helpless:
"Han Lianwen's IQ will always remain at the level of a six-year-old."

(End of this chapter)