Cheng Shi and Feng Tao went to Francis's basement laboratory, which was right next to the anatomy room!

As soon as the two entered, Fagan greeted them. He took out his pocket watch and looked at the time with a puzzled look on his face, then looked up at Cheng Shi and said.

"Agent Cheng is here so early. The teacher is developing the photos. Looking at the time, they should be finished soon. Please wait a moment!"

After Fagan said this, he continued to work on the work in hand, and the two of them found a place to sit down!

After Cheng Shi sat down, he looked at Feng Tao's confused eyes, smiled slightly, and then told Feng Tao how the three of them obtained fingerprints at Alva's house.

After hearing this, Feng Tao said with some surprise: "I didn't expect that fingerprints could be collected like this. Agent Cheng, why didn't you use this method in the case of a ghost cutting his throat?!"

Cheng Shi sighed and said: "Although this method of extracting fingerprints is very good, it is actually applicable to very few scenarios!

The most important thing is that he can only be of great use when there is a clear suspect, and he is only suitable for cases like this that are obviously the work of a small group of people!

What's the use of this method in a case like the Ghost Throat Slitting case with scant evidence and no obvious suspect?!"

Feng Tao sighed and said: "That's true, but this discovery is also very practical. In the future, there will be another way to determine the guilt of criminals!"

Cheng Shi nodded and said: "Indeed, it will give us another way to find clues, if we have everyone's fingerprints!

All you need to do is find the fingerprints at the scene, and then match the matching person in the fingerprint file, and then add countless surveillance points..."

Cheng Shi's originally excited expression gradually subsided. He also knew that it was impossible to achieve big fingerprint data in this era!

I had no choice but to stop the topic and start explaining to Feng Tao the detailed process of obtaining fingerprints. Francis also walked out of the sealed room where the photos were developed!

During the Republic of China, the film taken had to be developed in a sealed room, and before the photos were developed, they were not allowed to see light, otherwise the work would be in vain!

After Francis came out, he was stunned for a moment when he saw the two people opposite him, then walked up to them and said with a smile.

"You guys are here. I was just asking Feigen to invite you. Now it's easier. I'll give you these photos and I won't accompany you!"

Cheng Shi took a dozen photos, while Feng Tao said with a confused look on his face: "If you don't compare fingerprints with us, what are you going to do?!"

Francis said excitedly: "I don't want to waste time on matching fingerprints, I'm more interested in the principle of fingerprint appearance!

If I hadn't been afraid that Feigen wouldn't be able to develop the photos, I would have left them to him. I think you two also know the huge usefulness of this technology!

But its shortcomings are also obvious. The exposure time is too short, and it can only appear once, so it must be captured quickly with a photo!

If there is an accident in some part of the collection, that would be bad, and the cost would be too high!

Now I need to study the principle of its display, and then I will see if I can optimize this display technology!"

Cheng Shi's eyes lit up when he heard this, and he said with a smile: "This is indeed very important, the optimization will be successful one day earlier!

This technology can be used in investigating crimes a day earlier. As for comparing fingerprints, just teach the two of us!"

Feng Tao also echoed: "Yes, just go and study it, we can just compare it!"

Francis did not waste time, but entered another laboratory, and Feng Tao asked Fagan for two magnifying glasses!

The two took the photo and went out to find a brighter place. Cheng Shi and the two began to compare fingerprints!

Don’t think that comparing fingerprints is easy. After all, in this era, there is no computer automatic matching, it all depends on the naked eye matching between two people!

Moreover, the orientation of the fingerprints left will not be exactly the same every time, and different focus points will also cause different degrees of deformation, so there are a large number of blurred fingerprints!

The comparison between the two was very difficult. The first step for the two of them was to exclude Alva's fingerprints. After all, he had the most fingerprints!

But his fingerprints are relatively easy to rule out, because most of them are blurry and should have been left by Alva in his early days!

The second step was to eliminate the fingerprints of the three police officers. Fortunately, only one of the three searched the bedside position!

This also saved the two of them a lot of time, but it still took them more than an hour to complete the fingerprint comparison!

Although the two found many other people's fingerprints, those fingerprints were more blurry than those left by Alva before!

They didn't stay in the past two days at all. In addition, the two of them did not find any clear fingerprints other than the four people!

Feng Tao put down the magnifying glass in his hand, rubbed his sore eyes, lay on the chair and sighed.

"Quan Bai is busy now. Either that person didn't leave any fingerprints, or your guess is not valid. Now we have no choice but to hand Leis over to the public trial!"

Cheng Shi also put down the magnifying glass, slumped on the chair, sighed and said.

"This shouldn't be the case. According to common sense, this is wrong. Reis thought that what he did was right!

He said that he framed Alva because he thought Alva was also a member of the cult. If that was the case, he should kill him too?!

Moreover, Reis had already made plans to admit the murder, so after he killed the first person, did he still care about the second one?!

Since he was already prepared to admit his crime, why did he still frame Alva, and it wasn't very covert!

Either Reis is such a careless person, or the person who framed Alva is someone else!"

Feng Tao thought for a while after hearing this, and said: "This is indeed not consistent with common sense, but now that your evidence has not found fingerprints other than the five people, this can only become a permanent doubt in this case!

"

Cheng Shi's eyes lit up, and he quickly said: "Unless, he actually didn't want to give up Reis at the beginning, which is his most convenient weapon!

So he framed Alva first, but he didn't have enough time, so what he did was not very covert!

If we can identify Alva as the murderer, then he will save Reis; if we do not identify Alva as the murderer, he will push out Reis to take the blame!"

Feng Tao smiled and said: "This is reasonable, but it is just a guess!"

Cheng Shi suddenly remembered something, stood up and lay on the table again, speaking as he quickly fiddled with the photos on the table.

"I was too focused on the evidence of fingerprints just now, but I forgot that there were other pieces of evidence. He placed the hexagonal iron tool at the corner of Alva's bed against the wall. In order not to destroy it..."

At this point, Cheng Shi took out one of the photos and became excited, pointed at one of them and said repeatedly: "This is it! This is it!"


Chapter completed!