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Investigation Center.

The leaves of the green plants in the corridor were dark, like neglected old plants.

Several experienced detectives were giving advice to Jiang Yuan.

In the interrogation room, they discussed what should and should not be said.

Inside the interrogation room, the suspect Liu Chang had just finished reading the "Rights and Obligations Notification for Criminal Suspects" and was in the process of signing it.

Even if it was just a county public security bureau, they still followed the textbook step by step.

Otherwise, there would be people who wanted to teach you how to do things.

"What is your name?"

"Liu Chang."

"Have you ever used any other names or aliases?"

"No."

"What is your ethnicity and date of birth?"

...

"I want to see the footprints expert." Liu Chang answered a few questions and suddenly didn't want to cooperate anymore, shouting.

His expression was a bit panicked, and his face was pale. He wore half-framed glasses, but to be honest, he was still a good-looking young man.

He was also tall, quite advantageous.

Wu Junhao, who was sitting opposite him in a police uniform, felt his patience being tested and said, "We agreed to make a record first, and someone will come later."

"It's been so long, they should be here by now. If they can't come, just tell me, don't lie to me." Liu Chang's expression became serious.

His pupils kept changing.

Wu Junhao was fierce when arresting people, but he was gentle during interrogations. He continued to persuade, "There's no need to lie to you. If you want to see someone, they need to be notified and then come over to see you..."

"You said it would take fifteen minutes."

"We haven't reached that time yet."

"Then show me the time."

Wu Junhao hesitated. It wasn't appropriate to show him the time. It was a basic rule of interrogation.

"Then I want to see my father." Liu Chang made a new request, which changed the expressions of everyone inside and outside the interrogation room.

A 25-year-old young man was still easy to manipulate.

People who entered the interrogation room would have all sorts of strange thoughts.

Many believed that their crimes were relatively minor and that they were innocent.

Liu Chang believed that he accidentally killed someone and firmly believed it.

This was the basis for their conversation.

In a real interrogation room, there would always be someone who was a bit foolish. This was the so-called principle of the interrogation room.

Liu Chang's brain suddenly snapped back to reality. This was the most nerve-wracking place.

If he refused to confess, the subsequent investigation process would become difficult.

It could be said that the happiness of hundreds of cadres and police officers in the next week or two depended on Liu Chang's attitude at this moment.

As for Liu Chang's father, he was a 50-year-old seasoned official with a certain rank. Describing him as difficult to deal with was an understatement.

"You're already 25 years old, you don't need your parents to accompany you." Wu Junhao suddenly said, piercing Liu Chang's sensitive heart.

He had seen too many young boys who wanted to become men through language and shouting.

A slight poke at their "growing pains" would cause an explosion.

Liu Chang did indeed become angry, his hands trembling as he shouted, "I want to see the footprints expert, hurry!"

But he no longer shouted to see his father.

Wu Junhao breathed a sigh of relief, but he didn't dare to continue the interrogation.

Liu Chang's father was actually being held in the adjacent room for interrogation.

Liu Chang's father was much more experienced.

He seemed like a leader with some power. When he was just arrested, he still had an official tone and was a bit fierce.

People like him usually had an iron will in most situations, like a piece of excrement in a pile of stones that had been baked in the scorching sun. The surface was slippery and the shell seemed hard, but once it was broken, it was empty inside.

But for Old Wu, he wasn't worried about interrogating Liu Chang's father.

For someone like him, the simplest method was to take their time. Even the hardest piece of excrement, when soaked in water for a few days and stirred with a hand, would dissolve.

Experienced people who had power and money were easily corrupted and had many weaknesses.

On the other hand, young people like Liu Chang had drastic mood swings, were unstable, and were prone to changing their statements.

Just a moment ago, he confessed everything in the car, but once he entered the interrogation room, he changed again. Who knew what strange behavior he would exhibit next.

Someone who had killed before would undoubtedly have some psychological issues.

Wu Junhao didn't want a clear-cut murder case to turn into a confusing mess.

Outside the interrogation room.

The professionals realized that Liu Chang's emotions were uncontrollable. After quickly briefing Jiang Yuan, they let him in.

A group of people eagerly watched the monitor, clenching their fists, as serious as fans of the home team.

Jiang Yuan knocked on the door and entered the interrogation room.

Wu Junhao used the largest interrogation room, which was long and wide. It was blocked by iron railings one-third of the way from the door.

Liu Chang sat inside, unable to find even a window. The overhead spotlight made him even more agitated.The so-called "tiger bench" was also fully stretched.

The 1.93-meter-tall man raised the chair to its highest point, with his legs overflowing and his arms extending beyond the table, making it almost impossible to lock the handcuffs.

The two restraining straps behind were not a problem, but Wu Junhao did not put them on him.

Putting this thing on was uncomfortable, definitely more uncomfortable than a seatbelt. He was afraid that Liu Chang, who was about to confess, would not be happy.

Before the suspect confessed, the police were like trusted big brothers.

Only when they fell into their hands would the police show their fierce side.

Mature police officers are usually like mature scumbags.

And immature police officers are usually like immature scumbags.

Jiang Yuan was also very tall. When he entered the room, under the strong light, it almost felt like he was sitting inside himself...

Liu Chang was also similar. In the blink of an eye, he almost saw another himself walking in.

Both of them seemed a little stunned when facing each other.

Liu Chang was also a legitimate second-generation official in a small place, and he looked carefree.

"This is our footprint expert, Forensic Jiang," Wu Junhao gestured for Jiang Yuan to sit beside him and introduced him to Liu Chang.

"How old are you?" Liu Chang's pupils shrank for a moment, and he asked first.

Jiang Yuan felt strange when facing such a young suspect. Although he had seen the case file and heard about it along the way, including looking at it outside, it still felt strange to face it directly, face to face.

"24 years old."

"Younger than me?" Liu Chang suddenly looked excitedly at Wu Junhao! His feet were also trembling.

"Who are you trying to fool? Is it interesting to use a fake one?"

Wu Junhao was stunned, then slapped his big head with his big hand.

"Why didn't you say so earlier? We have so many people, it's convenient to use a fake one. Do you think experts should be in their forties or fifties, preferably with white hair or a little hair?"

Wu Junhao wiped his greasy hair and continued, "If I had known, I would have brought a bald police officer. It's so far to invite Jiang Yuan over. Our team lacks everything except age and baldness."

Liu Chang was speechless by what he said.

And he felt that this strong man made sense.

He carefully looked at the young man in front of him again.

"How did you figure out my height? I heard that the previous footprint expert was also a well-known expert in the province."

His question was a bit professional, indicating that he had indeed done some prior research.

Jiang Yuan asked back, "Why do you care about this?"

"Just want to know. I am much taller than normal people. When the incident happened and I saw footprints all over the floor, I knew something was wrong." Liu Chang seemed calm and said, "I reported a lower height, it was my own decision."

With just this sentence, Liu Chang revealed a lot of information.

If his words were true, first of all, it indicated that Liu Chang did not know the previous fingerprint expert's judgment of his height.

In other words, his father's relationship did not reach the level of leaking case information.

On that day, Chen Wenming judged it to be between 178 and 185, and Liu Chang was too tall. Otherwise, he could have reported 185 and directly entered the range. At that time, the intensity of the screening by the task force would definitely be several times greater.

Secondly, Liu Chang said that reporting a lower height was his own decision, which means that someone else made other decisions for him.

Most likely, it was his parents.

In other words, this sentence proved that his parents did indeed protect him.

Finally, Liu Chang also revealed his psychological state.

It is not a new thing for young people to want to decide their own future and to resist the world with their own cognition.

It's just that some people end up becoming the founding father - like Sun Yat-sen.

Some people end up just being a murderer - like Qin Wuyang.

Jiang Yuan looked deeply at Liu Chang.

From the feeling of facing him, could it be that this guy also wanted to achieve something?

He thought that he could come out after an unexpected murder and prepare for the next time?

"If you don't say it, I won't say it either." Liu Chang felt that he could control Jiang Yuan.

Jiang Yuan smiled and said, "Judging height is actually a systematic work, and it's written in books."

"I just want to hear it from you."

"Okay, the simplest point is to judge height based on foot length. There are some empirical rules."

Jiang Yuan slowly said, "For example, in ancient China, there was a saying that the height of an ordinary person is seven times the length of their head, and the length of their foot is about the same as the length of their head."

"Isn't it said that some people have a nine-head figure?"

"That's an exception. Let's talk about the general rule first."

Liu Chang agreed, "Okay, so it's multiplied by 7?""People from Shanghai multiply by 6.75, those from the Northeast multiply by 6.876, those from Shaanxi multiply by 6.734, those from Chongqing multiply by 6.856..." Jiang Yuan gave a comprehensive answer.

"But I was wearing shoes that day!" Liu Chang's biggest concern was this.

"And the shoes were a bit smaller than usual, they were tight, the size was different from usual."

"You could tell?"

"I could tell." Jiang Yuan nodded, asking, "Shall I continue?"

"Go ahead."

"To further determine the height, we need to add the data of foot width. Your feet are relatively long, but wider than normal. This is another detail."

Listening to the young forensic expert in front of him, Liu Chang found himself somewhat agreeing:

"Chinese people's feet are generally wider than Europeans', so foreign brand shoes tend to be tight."

His feet were wider than standard, which made it difficult for him to buy shoes.

"Then there's the area of the foot and the width of the heel. Adding these two data points, the regression equation formed has a higher usability." Jiang Yuan explained in detail, after all, these were all public information.

According to the interrogation experts, it was beneficial to chat with Liu Chang a bit more at this point.

Upon hearing the term 'regression equation', Liu Chang frowned, "You're talking about average data, right? How do you know my height is 193 cm?"

"The actual conclusion should be between 191 and 195 cm, I judged 193 cm to be the most probable." Jiang Yuan replied.

He further explained, "It's actually based on experience, plus the indentation, stride length..."

Outside the interrogation room, the leaders were all confused, some were baffled, some were impressed, watching the young forensic expert and the young suspect converse, they felt the tension like in a TV show.

It was thrilling yet indescribable.

"Can you explain in detail?" Liu Chang asked.

"It's your turn to talk." The muscular Wu Junhao interjected, "Let's update the interrogation record first, you can continue your detailed discussion later."

"What's there to update." Liu Chang leaned back slightly, but the iron chair didn't allow him to lean back further, causing him to frown.

"Let's start with why you killed." Wu Junhao didn't follow the order and asked directly.

Liu Chang sneered, "Haven't I already said?"

"This is the formal interrogation. What you say now will be considered as your confession..."

Liu Chang lifted his head, slowly saying, "I was stupid back then, I had a run-in with his son, we exchanged a few words, the kid was dressed in rags..."

Recalling the scene seven years ago, Liu Chang felt a hint of regret, shaking his head, "Anyway, I wanted to get back at him, I happened to be going there that day, so I rode a bicycle to his house, I ran into his father, the old man wanted to fight me, I had to fight back, accidentally..."

"How did you know where his house was?"

"The kid told me himself. He said to go down the county road, there are two big lions with wings, that's their house." Liu Chang's voice became fainter and fainter...