In the hiking bag behind Zhang Dongsheng, there was indeed a pair of sneakers.

Forensic officer Gao An immediately put on his gloves and took out the sneakers. He looked at them carefully and said, "They are the same pair as the ones on the deceased's feet, and they are the same size!"

"Mr. Zhang, why don't you explain why you have a pair of sneakers in your bag?" He Jiahui asked.

"I was worried that my shoes would break during the mountain climbing, so I brought an extra pair as a spare, couldn't I?" Zhang Dongsheng defended.

"Then why is it the same model as the one on the deceased's feet?" He Jiahui continued to ask.

"So what if it's the same model? I like my father-in-law's sneakers, so I bought the same model!" Zhang Dongsheng was still quibbling.

"Mr. Zhang, what size shoes do you wear? The shoes in your bag don't seem to match your shoe size! Instead, they match the deceased's shoe size. How do you explain this?" He Jiahui sneered.

Just ask.

"Well..." Zhang Dongsheng was stunned for a moment, then continued to defend: "Actually, these shoes were brought for my father-in-law. I was worried that his shoes would break during the mountain climbing, so I prepared an extra pair!"

Zhang Dongsheng was obviously completely panicked, and his words became increasingly inconsistent.

However, everyone is not a fool. Zhang Dongsheng's excuse only confirmed his suspicion.

He Jiahui showed a helpless expression. He sighed and said, "Mr. Zhang, it seems that you know nothing about current technology. In the face of modern technological means, your excuses are too weak.

You must know that even the same kind of soil will undergo different changes under different environments, such as sunlight and wind. Not to mention that the soil will also be mixed with tiny particles such as pollen and seeds. These are

It can be tested.

Forensic evidence only requires sampling the soles of your shoes and comparing them with the soil on the cliff to prove whether the soil on the soles is the same as the soil on the cliff.

If the soil on the soles of these shoes is the same as the soil on the cliff, and the soil on the soles of the deceased is also the same as the soil on the cliff, it can prove the inferences I just made.

Only one set of footprints was found on the cliff. If the soles of both pairs of shoes are stained with the same soil, and the shoes are of the same style and size, the only explanation is that the owner of one pair of shoes forged the footprints."

"The one who forged the footprints is either the deceased or you." He Jiahui said, looking at the deceased not far away, and then said: "You can't expect a dead person to fake the scene, right?"

These words broke the last trace of luck in Zhang Dongsheng's heart. There was a trace of despair in his eyes, and then he sat on the ground with his legs spread out.

"Yes, it was me who killed my father-in-law and pushed him off the cliff!" Zhang Dongsheng finally admitted his crime.

"He is your father-in-law and your relative. Why did you kill him?" He Jiahui asked curiously.

Zhang Dongsheng raised his head and sighed: "It's all my fault. I lost my bet and ended up with a gambling debt. In order to pay off the debt, I borrowed a loan shark. Later, the interest compounded and I really couldn't pay it back. So I went to beg my father-in-law.

, I hope he can lend me money.

But my father-in-law refused to lend me money! If he had no money and refused to lend me money, I wouldn’t blame him, but he is obviously rich, with tens of millions in savings and pension! He only

If you need to lend me a little, you can help me solve the problem.

But he didn't lend me a penny. He wanted to see me die! Do you know how cruel those loan sharks are? If those people can't get the money, they will really kill me! I don't want to die, I

I don’t want to have my hands and feet chopped off either!

So I can only kill him so that I can get his inheritance to repay the loan shark. In addition, I bought an insurance policy for my father-in-law, and the beneficiary is my wife. If my father-in-law dies unexpectedly, I can still make a fortune!

So I planned today’s game. I knew that my father-in-law liked to climb mountains, so I bought him a new pair of shoes. Then I asked him to try the shoes and asked him to climb mountains. Then I led him to the cliff and pushed him

Go down.

Next, just like you said, I cleaned up the traces of the scene, put on another pair of shoes that I had prepared in advance, and faked the footprints by walking backwards, making the police think that my father-in-law had slipped and fell down the mountain."

He Jiahui nodded slightly, and then said: "But you didn't expect that there were holes in the footprints you forged. If you slipped and fell down the mountain, it couldn't be a complete footprint.

When I raised this doubt, you hurriedly said that Principal Xu committed suicide because he missed his deceased wife, and the purpose was to guide the police in the direction of their investigation."

"Yes, I said that my father-in-law committed suicide because he missed his mother-in-law, but you doubted me even more, right? You have met my father-in-law before and chatted with him. I ignored this, and I am self-defeating!

Zhang Dongsheng showed an expression of annoyance and sighed: "I deserve my bad luck. I actually chose to take action today and met you student police officers!"

"This has nothing to do with luck. Skynet is very careful and meticulous. If you break the law, you should be punished by law! Even if you don't meet me, the police will discover your crime and bring you to justice." He Jiahui said coldly.

.

These words made Miao Zhishun next to him blush. He had indeed planned to treat this case as if he had fallen off a cliff. If it hadn't been for He Jiahui, he might have let the real culprit go.

To demonstrate the embarrassment, Miao Zhishun took out the handcuffs, stepped forward and cuffed Zhang Dongsheng's hands, preparing to take him away.

Zhang Dongsheng did not move, but asked: "Can you tell me how you suspected me? Even if you make me understand!"

He Jiahui hesitated for a moment and finally explained: "At the beginning, I didn't suspect anyone. It wasn't until I saw the footprints on the cliff that I began to suspect that this was a homicide.

Footprints can analyze a lot of information, such as stride characteristics, gait characteristics, etc., and through strides, gait and footprint size, a series of characteristics such as height, fatness, gender, age, etc. can be analyzed.

For example, the physiological differences between men and women can be shown in the footprints. Generally speaking, men have larger steps and heavier indentations, and their footprints often have digging marks and soiling.

Women's steps are smaller, their rising and landing feet are stable, the indentations will be more even, and the edges of the footprints will be neater. In addition, the length of the footprints of men is generally longer than that of women.

In terms of age, generally young people in their twenties will have heavier indentations on the forefoot, lighter indentations on the back heels, larger dig marks on the toes of the front toes, and fewer scratches on the back heels in the footprints of young people in their twenties.

When you are about thirty years old, the indentations in various parts of the footprints will be more even, and scratches will begin to appear. When you reach the age of fifty, your steps will begin to become wider, the abduction of the step angle will increase, and the indentations on the heels will become heavier.

.

There is also height. For a taller person, his center of gravity must be higher and his lower limbs will be longer. When walking, his feet will be long and his steps will be loose. His body will sway a lot from side to side, which will cause the heels to deviate outward.

Press, there is a virtual edge on the outside of the toes.

Short people have a low center of gravity and short lower limbs. When walking, their feet take short and compact steps. They are accustomed to taking long strides. They will sway back and forth more when walking, so dig marks will appear on the forefoot of their footprints.

I estimated that the height of the deceased was about 1.70 meters, and the footprints you left at the scene did not match the footprints of a man in his sixties and about 1.70 meters tall, so I began to doubt these footprints at that time.

It’s fake!”

The school policemen nearby were stunned. They had never thought that so much information could be analyzed from one footprint.

Forensic expert Gao An even felt that if every police officer was like this, his job would be in jeopardy.

Miao Zhishun even moved closer to Li Wensheng and asked in a low voice: "Does your police academy teach such in-depth courses now? Fortunately, I attended the police academy more than ten years ago, otherwise I would never have graduated!"

"How come the police academy teaches these weird things! Besides, these can't be used as evidence in court!" Li Li Wensheng responded with a cold snort.

He Jiahui ignored the murmurs of others and continued: "Although the footprint analysis theories I just mentioned are scientifically based, they can only be used as a direction to solve the case, but they cannot be used as substantive evidence to accuse the suspect.

After all, everyone's walking habits are different. If a big man has short legs, or has a leg injury, or has arthritis, it will affect the footprints. So I just suspected the cause of death of the deceased at the time, and there was no actual reason.

confirmed by evidence.

It was not until later that I followed Sir Gao from the Forensic Evidence Department to the cliff and saw all the footprints, especially when I saw a pair of complete footprints closest to the cliff, that I was sure that the deceased did not slip and fall. There was a high probability that the deceased had not fallen.

It was his death.

It was also at that time that I thought about the murderer's method of committing the crime, but I still had no evidence, and I had been thinking about how to find evidence. When I came down from the cliff and saw Mr. Zhang, I knew that the evidence was there.

Got it!"

There was a trace of doubt in Zhang Dongsheng's eyes, and he asked: "There are several people here, why do you doubt me? How do you know that those shoes are in my hiking bag?"

Zhang Dongsheng's words also raised the doubts of everyone present.

"You are the last person who saw the deceased. If the deceased was killed, you are the biggest suspect. Of course, I will suspect you first."

He Jiahui pointed to the hiking bag again and replied: "The reason why I guessed that the shoes were in this bag is because you have been carrying this hiking bag since I met you.

It takes a lot of energy to climb up here from the bottom of the mountain. Even those of us who are professionally trained police officers will take off our backpacks after arriving at the destination to reduce some weight and allow our bodies to rest.

The physical fitness of ordinary people is definitely not as good as that of us police trainees. To be able to get here, it must have consumed a lot of physical energy. If there is a chance to rest, they will definitely take off their backpacks instead of continuing to carry them on their backs.

You can look at the companions who came with you to climb the mountain. They have all taken off their backpacks, but you are the only one who keeps the hiking bag on your back. Don’t you feel it is very heavy?

The possibility I can think of is that there is something very important to you in your bag that makes you afraid to take off the mountaineering bag easily, so you would rather bear the weight of the mountaineering bag than carry the bag on your back.

Except for the police and the police trainees, they are all disciplinary forces. No one will steal your things. So the question is, what is it in your bag that makes you so cautious that even the police cannot trust you?

The answer is the sneakers you used to fake the scene!"

"I see, I thought my plan was perfect, but I didn't expect it to be full of loopholes in your eyes!" Zhang Dongsheng let out a long sigh.

"No crime in this world is perfect. As long as you do it, there will definitely be loopholes!" He Jiahui said.

Next to him, Miao Zhishun waved his hand and said to his men: "Take the person away!"

Watching Zhang Dongsheng being taken away by the crime team, Qiu Junxuan came over again and asked: "Jiahui, I have another question, what if Zhang Dongsheng didn't put the shoes in his bag, but found a place to throw them away?

, or burn it directly, then wouldn’t we have no evidence to arrest him anymore?”

"That pair of shoes is the most direct evidence of Zhang Dongsheng's crime. If it were you, would you throw such important evidence everywhere? If it was picked up by others, it would be exposed that he forged the scene.

It is not difficult to deduce that he killed Principal Xu."

He Jiahui paused and then said: "Many murderers will not leave the murder weapon at the scene, but will take it away. The principle is the same.

Those shoes are direct evidence that can convict Zhang Dongsheng. They are more harmful to him than the murder weapon. There is nothing safer than carrying it with you.

As for burning the shoes, he would definitely do that, but not here. The sneakers contain petrochemical components, which will not only produce thick smoke but also a strong smell when burned.

Thick smoke and smell will attract the attention of others, and there is a risk of being discovered. If someone sees the thick smoke or smells the smell and thinks it is a forest fire and comes to check, wouldn't Zhang Dongsheng be at risk of being exposed?

So Zhang Dongsheng did not dare to risk burning the pair of sneakers here, so he could only take the shoes with him. I guess according to his plan, he should take the shoes away and then destroy them privately, so as not to attract the attention of others. "

"It makes sense, I learned it again." Qiu Junxuan nodded with sudden realization. At this time, he was already admiring He Jiahui.

He Jiahui did not continue this topic. He could think of a more clever way to hide this pair of sneakers.

For example, come to the site in advance and dig a hole nearby. After forging the scene, you can directly bury the shoes in the hole. This will make it difficult for the police to find the shoes. Wait until the news has passed, and then come back to take away the shoes.
To be continued...