Chapter 226

Everyone looked at Old Liu.

"Are you serious?"

Old Liu said, "What about it? If Chen Fan were the criminal, this group wouldn't be able to catch him at all, so we let Chen Fan play the criminal and explain things to these people from the criminal's perspective. Is there any problem with that?"

"What the heck?"

Damn, you're making me play a criminal.

In the afternoon, Chen Fan and a few others drove over to the police academy.

Inside, Old Song said, "How about I put a pair of handcuffs on you?"

"Do you believe I'd take your handcuffs and put them on your daughter?"

"????"

Pfft— hahahaha.

The audience started laughing along.

"Killing me, hahaha— Song Zuer's eyes on Chen Fan are practically pulling threads, but her old man just won't let go."

"Sure enough, fathers-in-law are all the same under heaven—no matter how you look at the son-in-law, it just feels awkward."

"I think Chen Fan's pretty great, why won't Old Song accept it?"

"Mm, how should I put it— once you have a daughter, you'll understand."

After getting out of the car, a group of people immediately rushed out from the door, mostly girls, who swarmed around Chen Fan and showered him with flowers.

Old Song watched, speechless.

Chen Fan said, "Did you forget? I actually have another identity— I'm a fresh-faced idol. How did you get so familiar with me? Did you forget I'm a celebrity?"

Damn, that actually seems true.

Meanwhile, Chen Fan went inside the room and found Li Tian standing at the podium. Chen Fan was speechless and said, "Why do I have to give the lecture together with you?"

"This is the leadership's arrangement— they're preparing to set up a training class to give these students on-site instruction. Old Liu did it before too; now it's just your turn."

At this moment someone shouted.

Countless people immediately saluted, then sat down.

Chen Fan froze for a moment, then quickly returned the salute.

Only then did Chen Fan realize that he seemed to be, somehow, a bit taller than these students.

Li Tian said, "I won't waste words with everyone. I'm going to show you a picture here, taken on the scene— these shoe prints. Today I'll explain footprint analysis to all of you."

"Generally, based on the state of the foot, we mainly divide footprints into three categories: barefoot footprints, shoe-wearing footprints, and sock-wearing footprints.

Now let's talk about what we can see in each type of footprint:

First, barefoot footprints. This type mainly reflects the characteristics of the sole of the foot, especially the structural features of the foot. Because there's no external interference, the influencing factors are relatively few.

Barefoot footprints on smooth surfaces, especially surfaces like ceramic tiles, can sometimes reflect the ridge lines on the sole of the foot— professionally this is called friction ridge skin. This friction ridge skin is actually similar to fingerprints; under good conditions, it can accurately identify each person's characteristics.

Shoe-wearing footprints (shoe prints), on the other hand, can only be used to analyze the external structure of the sole and the sole's tread pattern. But this type of footprint is actually the most common at crime scenes, and it's one of our key points of analysis.

Sock-wearing footprints (sock prints) fall between shoe prints and barefoot prints. Generally speaking, they can only reflect the sock's fabric structure, the foot's structure, and walking-movement characteristics."

Li Tian pointed at the picture on the blackboard and said, "Tell me, what do you see?"

At this moment someone raised a hand and said, "I can see this person seems to be male."

Mm, not bad— they can already tell male from female.

Someone else raised a hand and said, "The body weight should be about seventy kilograms."

Still others kept raising their hands— these were the top students in the class.

Li Tian said, gratified, "Then let Chen Fan say a bit. If you were the criminal, what would you do?"

Chen Fan, dark-faced, said, "Do I really look that much like a criminal?"

"Yes."

At this point Chen Fan was thoroughly annoyed and said, "If it were me, these, these, these— you wouldn't be able to tell any of them apart at all."

Li Tian was dumbfounded and said, "Why not?"

Chen Fan, standing on tiptoe, said, "What if I deliberately made some blurry footprints? And then, what if I tried walking barefoot? And then, what if I mixed them together— wouldn't that work?"

"How would you manage walking barefoot?"

"Just smear some stuff on my feet, make a mold— wouldn't that do it? I said, since I'm going to commit a crime, I'd definitely think about the consequences, so naturally I'd handle all this properly. Anyway, no matter how you deal with the evidence, traces can still be left behind, so why not just scramble the evidence— wouldn't that be perfect?"

Li Tian shut down.

The students below were also dumbfounded, staring at Chen Fan.

Hey, if you do it like that, how are we supposed to do our jobs?

Li Tian picked up his phone and called the officer from before, asking whether there was anyone near the woman capable of counter-surveillance.

Or someone of high caliber and education.

The officer immediately locked onto one person— the husband.

Well, the perpetrator's been found.

Li Tian put down his phone and said, "I'll give you credit, you're right. We've found the person now— the perpetrator is most likely the husband. We're just waiting for the results from that side. You said it very well— the scene really is just as you guessed, all deliberately hidden. But tell me, how did you tell?"

"I just thought it through. I'm the criminal, so naturally I'd do it that way. Besides, the footprints were too obvious— any fool could tell these were deliberately left for you to see."

Li Tian laughed and said, "Alright, let me explain my reasoning to you. Here, here, and here— these footprints all have overlapping sections. Generally speaking, overlapping like this is very difficult to achieve."

"Footprint analysis in theory is what's in the textbooks, but in reality, it's very troublesome."

"Generally speaking, footprints come in trails, but often conditions are good, and getting one very clear footprint is already considered excellent.

Most of the time, the footprints we discover are abnormal footprints. Abnormal footprints refer to those whose outlines are clearly deformed, incomplete, blurry, overlapping, and whose characteristics are unstable.

Of course, under ideal conditions, we all hope to obtain trail footprints, because these trail footprints can not only reflect the external morphological features of the bare foot or shoe/sock, but also reflect the walking gait characteristics of the person who left them. This information will undoubtedly greatly increase the accuracy of solving the case, and help lock down and calculate more information about the criminal suspect."

Li Tian's words struck the audience one by one, bringing them immense shock.

Although it was all from books, hearing these words from Li Tian still made the young men feel quite gratified.

"Regarding how to estimate height and age from footprints, you also need to analyze one more factor. This data — I can give it to you — it's called the height-ratio data."

Everyone froze.

"Mm, what you've learned is the average. The average height of people differs by region, so you have to calculate using a coefficient. These numbers vary, but once you run the calculation, you can directly look up a lot of heights."

Everyone nodded.

Chen Fan said, "Where did this stuff come from?"

"Some shady software leaked some of our country's data abroad, and then we intercepted it and got hold of this data."

Everyone instantly grew alert, knowing what this implied.

At this point, Li Tian said, "Everyone quiet down a moment. I'm going to play a clip of audio for you."

Audio?

Soon, everyone heard the sound of high heels clicking down a corridor.

The sound was crisp, making people begin guessing just how beautiful the person must be.

At this point, Li Tian said, "A skilled teacher can listen to the sound and directly deduce a person's height, weight, and even their occupation."

Everyone looked at Li Tian with curiosity.

And Li Tian, looking at Chen Fan, said, "What do you make of this?"

Chen Fan was instantly disgusted.

"Li Tian, you have no shame! Just to disgust me, you specifically had a man wear high heels?"

?????

Li Tian was completely numb this time.

"What do you mean?"

"This person walking in high heels is clearly not used to it — they don't wear high heels often. But a woman wearing them and a man wearing them produce two different sounds. A man will unconsciously lean forward, and at that point the sound becomes messy with the ball of the foot landing first."

"But this person isn't committing a crime for the first time, so this person has deliberately trained themselves to walk this way."

The crowd below looked at Chen Fan.

"Go on."

Li Tian urged.

Chen Fan said, "Mm, if I were to train myself to walk in high heels, then the first place I'd want to go would be the girls' dormitory. Once I got in, wouldn't all those women be mine? Hahahaha."

Li Tian directly tossed out a pair of handcuffs and said, "I really want to slap the cuffs on you right now. That sound really is from the girls' dormitory — unfortunately, you guessed one thing wrong."

"Isn't it just the abandoned girls' dormitory?"

?????