Chapter 167: The Real Case

The small lecture hall of Qinghe Bureau is located on the first floor of the office building.

The green plants inside were a little dry, but no one cared.

Along with other unimportant departments, it has its doors open to welcome visitors from all directions. Including people who don’t know the truth, as well as police officers from all over who don’t know the truth.

However, the utilization rate of the small lecture hall is still very high.

As a pragmatic bureau, Qinghe Bureau attaches great importance to the organization and reporting of various activities. Otherwise, its existence would be too meaningless.

Today, there were quite a few people sitting in the small lecture hall, and then there was a tall young man who was slowly lecturing, as if a college student was giving a speech on the stage.

It's just that the atmosphere is quite different.

The young policeman wears gray epaulettes, which means he is a technical policeman. He wears a full set of police uniforms and looks very good. Although he does not look like the popular little celebrity, he can be regarded as a gentle and sunny boy, and he has the bonus of a uniform. He sits and talks. At the banquet, he looked serious and acted freely, and taking a random photo seemed to be enough for publicity.

Jiang Yuan also wore a pair of plain glasses for this training. He was not actually nearsighted, but he had a tender face, so the master said it would be better to wear glasses.

The police officers sitting in the viewing area looked at the projection screen nervously and solemnly. The muscles in their cheeks were obviously slightly touched, and their eyes were wide open with great effort.

The 20 approximate fingerprints matched in the first pass are listed in vertical rows on the right side of the screen.

The three-quarters on the left are the one with the highest approximate fingerprint value, which is completely displayed.

"Well, let's take a look at the fingerprints returned from the first pass."

Jiang Yuan pushed the unfamiliar glasses frame with one hand, grabbed the mouse with the other hand, clicked, and enlarged the fingerprint on the left to the full screen again.

On the projection screen, the fingerprints displayed simultaneously are also relatively clear.

"Well, there is an exclusion point here." Jiang Yuan clicked twice and enlarged the fingerprint again. Then, his mouse drew a small circle on the right side of the fingerprint to show everyone.

For fingerprints that have been matched, what is implemented is not the standard of how many feature points are consistent, but whether there are inconsistent feature points.

This is easy to understand. If two fingerprints are the same, then in theory, all their feature points should be the same.

Therefore, if two fingerprints are inconsistent in one characteristic point, they can be considered "excluded".

In other words, the two fingerprints are not the same and are not the same fingerprint.

Following this idea, Jiang Yuan killed two similar fingerprints in a row.

At this time, Cao Keyang from the Qinghe Municipal Bureau, who was sitting in the front row below, said: "Teacher Jiang, should we put out the two fingerprints and compare them. This way we can directly rule them out, and everyone will not be able to see clearly."

Jiang Yuan reacted quickly and immediately clicked twice, causing the original fingerprint and the matching fingerprint to appear on the left three-quarters of the screen at the same time.

"Sorry, I was thinking that the first few fingerprints could be done faster." Jiang Yuan said sincerely.

Cao Keyang felt an inexplicable sadness in his heart and said hurriedly: "It's okay, this is not your problem, that is, we are giving a lecture. It is better to speak slower and more clearly."

"Yeah, I'll pay attention." Jiang Yuan nodded and said, "Then let's exclude the first two fingerprints again."

Then, Jiang Yuan used the exact same action to draw a circle on the right side.

The difference is that he then also drew a circle on the left side.

As a result, the audience below finally let out a coherent "oh" sound.

Seeing this, Jiang Yuan kept up his efforts, circled the second and third fingerprints, and then persuaded him to leave.

The "oohs" in the audience gradually became less and less.

Technicians whose fingerprint level is lower than LV1 begin to feel a sour feeling in their hearts, which is an indescribable feeling.

They finally understood that Jiang Yuan had written down all the original fingerprints.

Therefore, what I just did was a process of elimination purely based on memory.

There is no need to compare. You have the original pattern in your mind, and it is naturally very fast to eliminate or compare.

This is actually nothing.

If we start preparing lessons a few days ago, it will take a long time for everyone to remember the fingerprint... part.

The key is who will do this?

No one expects such fine fingerprints to be remembered.

Fingerprints are annoying to me.

On the other hand, when a fingerprint examiner pays attention to a certain difficult fingerprint over many years, it will gradually remember the characteristics of the fingerprint, but...

While some people were thinking wildly, Jiang Yuan ruled out three more similar fingerprints.

Then, I heard Jiang Yuandao: "At this time, it is generally recommended to read all 20 fingerprints. But we will not read it today, because the similarity of the fingerprints is getting lower and lower, which means that the probability of winning in the subsequent comparison has been Very low..."

Cao Keyang was stunned.

The crowd stayed.

Why does this feel so familiar?

It's like, when I was still studying, I lowered my head to pick up a pencil. When I raised my head again, I couldn't understand the teacher's words.

Even the language at the last moment is the same: I won’t write down the following steps, because they are relatively simple, so we will skip them, but the conclusion that can be drawn from this is...

Jiang Yuan had no intention of stopping.

After the first wave of fingerprint screening, Jiang Yuan pulled out the original fingerprints and said, "We are now marking the feature points for the second time."

dazzled,

The flowers are dazzling,

Out of sight, out of mind,

There is no use in being upset

After the operation, Jiang Yuan completed the marking of the thirteen marking points again.

Jiang Yuan said: "The position we just marked is a relatively common marking point. It didn't match, which means that the previous trace inspection did a good job in basic work. The suspect did not leave a very clear full fingerprint for us to match. It doesn't matter, let's try again."

Similar to the previous steps, Jiang Yuan threw the marked fingerprint into the fingerprint library for comparison.

After a while, the data returned by the fingerprint library was another 20 fingerprints in a row.

"We still need to compare left and right, right?" Jiang Yuan asked Cao Keyang this time to show politeness.

Cao Keyang nodded obediently and looked at the projector with concentration and calmness.

This time, he felt that he should be ready.

Two fingerprints were listed at three quarters of the left side of the projector.

Jiang Yuan's mouse moved gently, ticking a small circle on the left and a small circle on the right, and said: "It's ruled out, right? It's almost the same as before."

"The second one is also ruled out."

"Same."

"For the ones below, we don't need to tick them one by one."

As Jiang Yuan spoke, he quickly tapped his fingerprint.

He tapped the space bar on the keyboard, and a new fingerprint appeared on the screen, replacing the old one.

Since Jiang Yuan didn't need to tick a circle, he just took a look, said "no", and then tapped the space bar again to replace a new fingerprint.

Cao Keyang was still staring at it at first, but soon fell into the same state again:

Eyes

Confused

Eyes

Annoying

For a moment, Cao Keyang almost thought he was watching a short video.

The screen was full of Internet celebrities, and they all looked very similar.

Take a look, swipe away.

Take another look, swipe away again.

In a daze, half an hour passed.

At this time, Jiang Yuan also re-marked the feature points of the fourth wave, and said: "In fact, the feature points we marked just now are not very necessary, just to show you."

"In the future, if you have the opportunity and practice proficiently, you can omit the marking mode just now, because the feature points just marked are repeated with the previous two times. If it is just for trial, it is not efficient to do so."

"A more efficient way is actually to demarcate a small area and then mark as many feature points as possible, so that the accuracy of the fingerprints fed back will also be improved. Of course, the difficulty will be a little higher."

"Still the method just now..."

As Jiang Yuan was talking, the sound of the space bar was heard in the lecture hall.

Not only Cao Keyang, but most of the technicians in the lecture hall were a little numb.

Jiang Yuan did it too fast.

Everyone was a little behind.

They didn't think that if Jiang Yuan followed their speed and did fingerprints while explaining, wouldn't it take several days to do a difficult fingerprint.

The time for a training course is only two sessions of 4 hours in total.

An older trace inspector coughed, probably wanting to speak.

Everyone held their breath and stared, waiting for this brave brother to speak for them.

After all, it was a training in the disciplined forces. If the teacher was upset, it would be easy to get caught.

The sound of "pa pa pa" suddenly stopped.

For almost half a minute, Jiang Yuan did not speak or move.

The lecture hall was so quiet that Cao Keyang, who had given up a little, could not help but look up at the projection screen.

There were still two fingerprints on the projection screen.

The original fingerprint on the left had the identity of a difficult fingerprint, like a young lady wearing hip-wrapped pants, who looked naked but showed nothing.

The fingerprint on the right in the fingerprint database was ordinary, like a frosty queen in a professional suit, with sharp eyes and refusal movements, without any flaws on her body...

"You got it right, right?" Jiang Yuan added a sentence later, which was considered part of the lecture.

Cao Keyang was stunned. What does "you got it right" mean?

He looked at the original fingerprint on the left, and then at the fingerprint in the fingerprint database on the right.

They seem to be quite similar.

Almost the same.

No flaws.

Cannot be ruled out.

Then... can't we just identify them as the same?

In the end, the hip-wrapped beauty and the frost queen are the same?

Cao Keyang's people were dumbfounded.

Not only Cao Keyang, but half of the police officers who were receiving training were dumbfounded.

At this time, Jiang Yuan began to skillfully write the "identity identification" appraisal letter and apply for review.

There were more than 40 people in the room, and Jiang Yuan was the only one filling out the form.

Everyone understood the part of filling out the form.

"Wait for the review here for a while, I'll find a phone number for the jurisdiction here." While Jiang Yuan was speaking, he said to the trainees: "Sorry to delay everyone for two minutes. After all, the suspect has been locked in. It's polite to make a phone call."

"It's okay, it's okay." A group of police officers shook their hands restlessly.

Jiang Yuan then switched back to the case details, found the information of the local police station, and laughed: "It's from Miaohe County. I talked to them on the phone before. Wait a minute."

Jiang Yuan was doing a province-wide fingerprint campaign, and he matched the fingerprint of a homicide case in Miaohe County, so he had the phone number of the captain of the Miaohe County Criminal Police Brigade.

Jiang Yuan dialed the number, and soon he heard the smiling voice of the criminal police captain of Miaohe County: "Forensic Doctor Jiang, why are you calling me when you have time? Is that a good thing?"

"I just won an ordinary case, a robbery more than six years ago... Yes, I will send you the specific information on the intranet, yes, yes, oh... the review passed... You're welcome, you're welcome."

Jiang Yuan was sitting at the lecture table, and the radio was good. Almost all the conversations between the two on their mobile phones fell into the ears of everyone.

The technicians present were all in a daze.

The criminal police captain of Miaohe County has such a good temper?

Can such a good-tempered person become the captain of the criminal police?

Also, what just happened?

In the eerie silence, Jiang Yuan completed the steps of sending information through the intranet.

"Okay, the review has passed. Then, there are new key clues for this robbery case six years ago. Next, it depends on Miaohe County to locate and arrest the suspect. Yes. As far as we are concerned, we have completed the fingerprint comparison work in the case just now. "

Jiang Yuan clicked off the pages he had just opened and completed the final finishing work.

"Let's find another typical fingerprint and try the same method again to see if it works." Jiang Yuan rummaged for fingerprints again.

The buddy who had just been clearing his throat finally couldn't bear it anymore and stood up with a "huh", but what he wanted to say completely changed: "Was what we were doing just now a real case?"

"Yes." Jiang Yuan responded and said: "So it is a practical lecture. Well... can you get used to the content of what I said and the style of my lecture?"

"Yes, yes, yes, it's just, no, we... no, you... no, you just solved a robbery case?" The buddy who cleared his throat probably couldn't accept this.

Soon, the small lecture hall was filled with people.

Someone even sent a message quietly: Brother, come and see the gods.

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