The King of the City

After investigating Dong Jun, his suspicion became more and more serious. The detectives who solved the case together with Ma Zhiyu also thought that Ma Zhiyu was the murderer and didn't care about these things.

"Mr. Lin, you are humble." An old criminal policeman who looked to be in his forties said: "You saw this immediately after seeing the shoe prints left by the murderer at the scene of the first case, and I heard that it rained a lot last night, you all checked the scene without umbrellas, and it is not easy to analyze this in a short period of time."

"Indeed." Some other detectives nodded.

They all have an idea in their hearts, that is, Lin Chen's professional knowledge is very rich, and it is no worse than theirs.

Ma Yong and Ma Zhiyu, who were sitting at the bottom of the conference room, after hearing Lin Chen's analysis, Ma Yong glanced at their son and thought to himself, why didn't he spend more time on the footprints left by the murderer at that time.

Ma Zhiyu kept his head down and his fists clenched tightly. If it wasn't for Ma Yong's request, he wouldn't want to stay here and suffer those strange eyes.

Lin Chen193 did not respond to the flattering words of the detectives. He continued: "At the scene of the first case, in addition to the wrong footprints of the murderer, there is also the position where the murderer tied the rope."

Lin Chen walked to the computer by himself, operated it twice, and put a photo on the big LCD screen.

The first crime scene appeared on the screen, the tree tied with the rope, the tree was behind the street light, and there were two thick branches.

Lin Chen pointed to this photo and said: "Please look at these two thick branches, one is 1.41 meters from the ground, with many small branches growing on the branches, and the other is closer to the street lights, 1.69 meters from the ground, 1.69 meters from the ground. This branch has a smooth surface and no branches."

"The murderer chose to tie the rope to this tree, why didn't he tie the rope to the branch that was closer to the street light and had a smooth surface 1.69 meters above the ground, but tied the rope 1.41 meters above the ground, covered with small Branches, it is very inconvenient to tie ropes, and what about branches that will tie your hands?"

"Because the murderer is not tall enough, it can be said to be relatively short, so he chose the branch that was 1.41 meters above the ground, instead of the one that looked better to tie, but was 1.69 meters above the ground." Director Li responded. .

"Yes."

Lin Chen nodded and said, "According to the length of a person's feet, you can judge a person's height.".

417 Get the height and weight [3 more for subscription]

Lin Chen said: "The length of a person's foot, multiplied by 7 is his height. This 7 is not an absolute value. In the experimental investigation and comparison, the average ratio of height to foot is 1:7.0831, and the standard data is 1: 6.876."

"In other words, if a person's foot is 23.5 centimeters long, multiply 23.5 by 6.876, which equals 161.663 centimeters, and multiply by 7.0831, which equals 166.45285 centimeters."

"161 and 166 are the approximate height values ​​of this person with a sole length of 23.5 cm. Of course, the calculation of this sole of the foot varies from person to person and cannot be said very accurately, but for most people, it is still applicable. Can be a reference."

Everyone present quietly listened to Lin Chen's remarks. Although most of them knew about the professional knowledge that Lin Chen said, the values ​​that came out of Lin Chen's mouth still sounded different.

"23.5 times 7.0831 equals 166.45285..." A policewoman sitting in the conference room looked at Lin Chen on the high platform with her eyes, and muttered in her heart, "Mr. Lin, did he use a calculator beforehand, or did he do it mentally? If it's mental arithmetic, Mr. Lin's mental arithmetic ability is really good enough."

In addition to the policewoman's thoughts, many people present had this kind of thought in their hearts.

"Mr. Lin, please continue." Director Li said to Lin Chen.

Lin Chen walked to the LCD screen, pointed to the shoe prints left by the murderers, and said, "Everyone, look carefully at the shoe prints left by these murderers, from the depth and angle of these shoe prints. Look, this should have been left by the murderer when he used his toes to force."

"The length of this shoe print is 26.5 centimeters. According to the shoe print left by the force of the toe, the killer's foot should be within 21 centimeters in length."

"We take the murderer's foot length as 21 centimeters, multiply 21 centimeters by 6.876, equal to 144.396 centimeters, and multiply 21 centimeters by 7.831, equal to 148.7451 centimeters 々ˇ."

"Based on this value, the murderer's height should be between 144 and 148."

Lin Chen said: "I also said that the length of the murderer's feet is only an approximate value, and the calculated height is also an approximate value. It can be more certain that the murderer is a dwarf, and another reason is that he tied the rope at 1.4 feet off the ground. Rice is not good tied to a branch."

"It's not that the murderer didn't want to tie the rope to the branch that was closer to the streetlight and was better tied, but the branch that was 1.69 meters above the ground, out of reach of the murderer, or even more difficult to tie."

"The murderer is a short man, and the Dong Jun that Ma Zhiyu caught is a tall man. If Dong Jun committed the crime, with his height of 178, how could he choose the one that is 1.41 meters above the ground and has small branches that are not easy to tie? ?"

"Yes, based on these on-site evidence, it is very likely that the murderer is a short man, and his height should be similar to Mr. Lin's inference." An old criminal policeman said.

When the others were about to speak, they were interrupted by Lin Chen raising his hand.

Lin Chen put out the first photo of shoe prints at the crime scene, pointed to his own photo, and said, "At the first crime scene, there are two shoe prints under the tree, and these two footprints belong to me. , Ma Zhiyu said that I was destroying the scene, but he didn't know that I left it on purpose."

"The sole of the foot can judge a person's approximate height, and the depth of the shoe print can also judge a person's weight. The formula for calculating the weight is: On the same land as the footprint, place a plank with an area of ​​A, and put the total mass on it. For an object of M, let it sink to a depth H, which is the same as the depth of the footprint, and finally divide M by A and multiply the area of ​​the footprint."

"The murderer left a footprint about an hour before I arrived at the crime scene. The soil under the tree was soaked and softened by the rain an hour later. According to the degree of soaking and softening, plus my From the height, weight and sole area, it can be calculated that the weight of the murderer should be around 55 kg."

Lin Chen looked at the crowd and said, "The murderer is about 148cm tall and weighs about 55kg. With this height-to-weight ratio, it can be determined that the murderer is a short, fat man."

After hearing that Lin Chen had calculated the murderer's height and weight, Miao Yunfei and Zhang Tiannan's eyes were full of brilliance. This was the man they fell in love with. Although others knew this professional knowledge, Lin Chen was able to The fastest time to calculate all these things, which is unmatched by others.

Ma Zhiyu, who was sitting in his seat, noticed the gazes of the people around him looking at Lin Chen, he gritted his teeth, and said in his heart that this is amazing, he has also learned these professional knowledge, but he just forgot it.

"papapapa..."

There was a round of applause at the scene, and someone said, "Mr. Lin, your reasoning is very exciting. What are you talking about? We have to go through very tedious calculations to figure it out."

After the warm applause fell, a policeman said, "The goal of finding the murderer now is to focus on the murderer's height and size."

"...No hurry." Lin Chen waved his hand.

After hearing Lin Chen's words, everyone became puzzled. It was not enough to calculate the murderer's height and body shape. Is it possible to calculate other things from these things?

"What else?" Director Li asked.

Lin Chen looked at the forensic doctor who had been to the crime scene twice and asked, "Forensic doctor, has the murderer ever raped the victim?"

"No." The forensic doctor shook his head and explained: "Both of the deceased, the murderer stabbed her in the buttocks. The stab wound of the first deceased's vagina was oblique, and the second one's vaginal knife was oblique. The injuries are also inclined, and after an autopsy, no traces of sexual assault were found on the deceased."

Lin Chen nodded slightly: "The murderer didn't kill the deceased for the purpose of cheating. The wallet in the pocket of the second deceased is still there, which means that he may not be for money."

"The murderer does not kill for sex or money. There is another possibility, that is, the murderer kills for his pleasure, or he has resentment in his heart and wants to kill to vent his anger."

(Manno's)

"The first female corpse, and the second female corpse, have similar scars on their bodies, many slap prints on their faces, bruises on their bodies, their trousers were taken off, they were stabbed in the lower body, and then they were naked. Hanging naked on street lamps."

"From the point of view of criminal psychology, the murderer slaps the face of the deceased, it is a manifestation of hatred for the deceased, taking off the pants of the deceased, and letting her slap in front of the public eye, it is a sexual act .humiliation."