Chapter 265 Perfect assist, beautiful work
Extracting fingerprints is simple.
There is a water-soluble, non-toxic fluorescent spray in modern technology that can make fingerprints appear in seconds.
It is worth mentioning that this spray was jointly developed by Songhai Normal University and Bath University abroad.
What is really complicated is fingerprint identification.
For example, how to identify whether two fingerprints belong to the same person?
This depends on whether the fingerprint characteristics are consistent.
If the two fingerprints have more than seven similar points and the difference points can be reasonably explained, it can be considered as the fingerprint of the same person.
During this process, you will carefully observe the basic types and details of the fingerprint, such as the bifurcation points and breakpoints of the ridge line.
So, when the technician said "Ten Minutes", Yu Dazhang was a little surprised.
Being able to complete fingerprint verification in such a short time is bound to be an experienced professional.
The reason why he wanted to confirm his fingerprint was to verify a guess in his mind and to continue the next step of action.
The fingerprint identification process was very smooth. Just five minutes later, the technician gave a conclusion:
"The fingerprint on the kitchen knife belongs to one person."
Yu Dazhang nodded, then took out a piece of paper from his bag and handed it to him:
"Look at if the fingerprint belongs to this person."
The technician looked at the bright red bloody handprints on the paper, then raised his head to look at Yu Dazhang, frowned:
"The way you collect fingerprints is very special."
Yu Dazhang smiled:
"It's too much."
What am I praising you? The technician glanced at him and took the paper.
This time it was faster, and he gave the answer in less than two minutes:
"The five fingerprints match exactly, he just used the kitchen knife in his hand."
As I inferred... Yu Dazhang nodded to him, then turned to leave the stairwell.
He can basically determine that He Tianxin's four fingers were chopped off with a kitchen knife.
The suspect has never been here!
Then how did he give orders to He Tianxin?
Did you 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 with surveillance. If he appears in the hospital, he will definitely be photographed on his face.
If she had worn a headcoat as she used to, the medical staff would have called the police long ago.
Attacking doctors these days is no longer new.
Going to the hospital with a headscarf is not much different from going to the bank, and it will definitely arouse the alertness of the staff.
Exclusion method...
The suspect himself did not come, did not ask anyone to bring a message, and He Tianxin did not have a cell phone.
What other way can I use?
When he arrived at the door of the operating room, Yu Dazhang looked at He Tianxin's wife who was sitting in a chair and was anxiously waiting. An idea suddenly popped up in his mind.
Is there something she passed on?
As soon as this idea came out, it was like a seed germinated, quickly occupying Yu Dazhang's thinking space, making his thinking lively.
That's right, it's her!
If I were the suspect, this was the most convenient and secret way... Yu Dazhang quickly walked up to her and asked:
"After we leave during the day, is someone calling you to find He Tianxin?"
"How did you know?" The woman stared at Yu Dazhang in surprise:
"A man called and said he was a classmate and friend when he was in school. He heard that he was sick, so he called him to ask about the situation."
As expected... Yu Dazhang asked again:
"You didn't ask him how he knew your phone number?"
"No question." The woman shook her head:
"I probably 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:
"You asked them to call?"
"Yes." He Tianxin's wife looked as if she was taken for granted:
"He said he wanted to listen to Lao He's voice. It happened that Lao He had just used the medicine and was in good condition, so I gave him my phone."
Beautiful job!
Yu Dazhang was speechless.
He has made inferences about what follows. The suspect threatened his family and asked He Tianxin to commit self-harm.
He also specially prepared a kitchen knife for He Tianxin and placed it on the fifth and a half floors, deliberately letting him climb two more floors.
He doesn't have to do things like giving kitchen knives in person, but he often finds someone to do it for him.
There is no monitoring in the hospital stairwell, and there are many people entering and leaving every day, so it is very troublesome to check.
Even if the person who gave the knife was found in the end, it would be difficult to find the suspect through him.
Very calculating.
At this moment, Yu Dazhang understood Ding Feng a little.
The suspect's logical thinking is really meticulous, and each step is carefully considered and arranged in a thorough manner.
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 mostly an unknown black card.
The newest ⊥Xiao⊥Speak⊥Send⊥Six⊥9⊥Book⊥⊥⊥⊥Back⊥⊥⊥⊥!
It is now 2014, and you can buy this type of unnamed mobile phone card at any store that sells mobile phone cards.
Even in 2024, ten years later, there will be such phone cards, but the purchasing channels are even more secret.
If the telegram fraud exists for a day, such a phone card will exist.
This is business.
As long as you make money, someone will definitely do it.
Yu Dazhang then told the phone number to the local police and asked them to help investigate.
At the same time, they also checked the surveillance and investigated the knife-giving people.
Although I know there is little hope, I still have to do the work I should do.
The investigation can be unsuccessful, but no clues can be missed. This is also the most basic professional quality of being a criminal policeman.
The next morning.
Yu Dazhang and Liu Miao were about to go to the hospital to see He Tianxin's condition. Before they could go out, their phones rang at this time.
Investigate Han Lianwen's team called?
Yu Dazhang made notes on the phone numbers of these police officers, which is also the significance of grouping.
"We found him."
The police officers on the other side of the phone had a heavy voice and didn't sound very good.
You should be happy to find someone, right... Yu Dazhang certainly knows who the "he" refers to.
"Where is he?" Yu Dazhang asked.
"Tincheng." The policeman opposite the phone quickly replied:
"I'll send you the specific address later."
I couldn't afford to toss... Yu Dazhang couldn't help but complain in his heart.
Since I came to S Province, I drove back and forth between several cities for countless times, which made him feel like his body was about to fall apart.
After calculating the distance, it took about an hour and a half to drive from the current city to Tincheng.
Not too far.
Now more than 100 kilometers are not a long distance for Dazhang.
"You have already contacted Han Lianwen."
Yu Dazhang thought for a while and said:
"Tell me what you learned from him first, and try to be more detailed."
He decided to go to the hospital to meet He Tianxin before going to Xicheng.
Mastering more new situations will help him gain more initiative in the next conversation with He Tianxin.
"The person has contacted him, but he has not learned any valuable information from him."
The policeman opposite said a little helpless:
"Han Lianwen's IQ will always be at the age of six."
(This chapter ends)