The snowy courtyard has low walls and a vat in the corner. The oleanders planted in the vat were bent to the ground by the heavy snow. A cordon was set up at the entrance of the courtyard, and many neighbors and passers-by gathered around the door. A police officer stood tall
He shouted: Who is going to inform the relatives of this family? Does anyone know them?
The special case team looked at the line of footprints on the snow in the courtyard, and they were waiting for the arrival of the footprint identification experts from the municipal bureau.
Bao Zhan said: The murderer is not a bird and cannot fly. As long as he leaves footprints, he cannot escape.
Hualong said: I don't believe this line of shoe prints was left by a child.
Su Mei said: However, these are clearly the footprints made by a pair of children's shoes. It is impossible for big feet to wear small shoes. I can't even fit into those shoes.
A shoe print contains all the information about a person.
Gender, height, weight, age, walking characteristics, whether there are disabilities, the texture of the shoes, the place of origin, the condition, the places you have been... In criminal investigations, scientific judgments can be made based on shoe prints.
The leaders of the municipal bureau and Professor Liang drove here, and the footprint identification expert also brought a group of trainee police officers to the scene to observe and learn. The small courtyard became lively, and everyone walked carefully along the wall, not to damage the shoe prints in the courtyard.
We stood in a row on the corridor and watched with great interest how the footprint identification experts extracted the shoe prints in the snow.
In the past, the police's criminal investigation equipment was simple: shoe prints on the mud were mostly extracted with gypsum, and footprints on the snow could only be photographed to collect evidence, and then they watched helplessly as the footprints left by the suspects slowly disappeared.
The footprint identification expert first looked at the pair of shoes, then he grabbed a handful of snow, clenched it into a ball, crushed it and threw it away. Then he bent down and observed a shoe print with the naked eye. Finally, he took out a magnifying glass and
He walked to a clear shoe print in the middle of the yard and knelt down.
The trainee police officers snickered quietly. After a while, the footprint identification expert said something, and the scene became quiet and silent.
The footprint identification expert said in an unbelievable tone: This is impossible, I have never seen such strange shoe prints.
Professor Liang asked: Why is it strange?
Footprint identification experts said: These are not human shoe prints...
Everyone looked at each other, and a trainee police officer exclaimed: Is he a kid?
A terrifying picture flashed through his mind: at midnight, the courtyard was deserted, and a footprint suddenly appeared on the snow. Something stepped on it, and the clear footprints snaked forward... A pale-faced boy walked
Entering the wall, he turned around suddenly, revealing a bloodless face, and slowly disappeared.
Bao Zhan asked: Are these footprints moving forward in a backward manner?
The footprint identification expert shook his head in denial.
Hualong asked: Could it be that the shoes are worn backwards, with the left foot wearing the right shoe?
The footprint identification expert said: No, I need instruments to identify it.
The footprint identification expert took out a three-dimensional footprint laser scanning acquisition analyzer. This instrument can quickly, accurately and non-destructively extract on-site three-dimensional footprints. Using modern laser scanning three-dimensional measurement and computer technology, the digital collection of the original form of on-site three-dimensional footprints was realized
, store and transmit, directly record and display the three-dimensional data of each part of the footprint.
Su Mei used computer animation to restore the collected data on-site. In the animation, you can see how a row of shoe prints were stamped on the snow, but there were no people on the shoe prints.
A trainee police officer asked: What should this person look like?
Footprint identification experts said: Based on the step length data, the shoe prints do not conform to the foot placement, support, and take-off characteristics of an adult. The person who made the shoe prints should be a child.
Su Mei said: Their child is dead and this family has no children.
The footprint identification expert said: What I find difficult to understand is that this child is very strange. The length of the shoe print - the allowance - the internal and external difference + the difference in traces × coefficient = height. The child is 1.60 meters tall and weighs a full 80 pounds.
Hualong said: It's really unbelievable. A six-year-old child is 1.60 meters tall and weighs 80 pounds. This child is too scary.
Professor Liang said: Maybe it is not a child, but a woman, an old lady with bound feet. The three-inch golden lotus can completely fit into this pair of children's shoes. There is another possibility. Can anyone here answer the question, assuming you are the murderer, how would you leave?
this yard.
After the murderer leaves the scene, he will inevitably leave footprints on the snow in the yard.
How should I disguise myself?
The only answer is: the murderer
Leave other people's footprints to confuse the police.
None of the trainee police officers present could figure it out. Bao Zhan said: The murderer left the child's footprints. His weight and height indicated that the murderer might be a woman. She stood on her head, put on her shoes with her hands, and left the yard.
Professor Liang said: Yes, the American mystery novelist Carl wrote a classic detective mystery novel - "Footprints in the Sky", a whimsical trick and an impossible crime with hands and feet reversed, which also won Carl "
Known as the "King of Secrets".
Bao Zhan said embarrassedly: I have read this article, and I should thank Karl for inspiring me.
Professor Liang said to the trainee police officers: Criminal investigation reasoning is a kind of logical imagination. The biggest crime scene is outside this small courtyard. I will give you two small riddles about footprints and see who can answer them. Bao Zhan
There is no need to answer. A lonely old man died in the hospital. The old man was stabbed in the mouth with a sharp instrument. There was no murder weapon around, only the old man's own footprints. Who was the murderer?
The footprint identification expert pointed to the ice pick under the eaves.
Professor Liang nodded and said: Another difficult case. This is a real case.
A female lumberjack died naked in the snow. Her left arm was cut off. Blood was on a fallen dead tree. The ax was thrown nearby. The missing arm was missing. There were many trees in the snow.
There is a cable car line, and there are only the footprints of the female logging worker on the ground. The footprints extend for hundreds of meters. It can be judged that after the female worker's arm was cut off, she walked in the snow, and the clothes she took off were scattered across the hundreds of meters.
On the snow. An autopsy found that the naked woman's body contained her husband's semen... Half a year later, an apprentice at a game restaurant near the scene of the crime was arrested on suspicion of raping the proprietress. The police found that the apprentice was wearing the gold ring that the female logging worker had lost.
.
Excuse me, who is the murderer? How did the murderer do it?
The trainee police officers talked a lot, but no one could answer. Bao Zhan thought for a long time, but could not come up with an answer. Professor Liang allowed everyone to think slowly. Next, the trainee police officers assisted the special case team to conduct an in-depth investigation of the scene. In this room
Every corner and every item must be carefully investigated to find the traces left by the murderer.
Ms. Yun's husband drank water before taking the poison, and there was only his own fingerprint on the water glass.
An empty toilet cleaner bottle was found in the trash can. A Zippo lighter was placed on the computer desk. This kind of lighter requires special oil. A trainee police officer found an empty Zippo fuel tin can under the bed. Ms. Yun’s face
It was burned, so it must have been the fuel used. The bed was flat and had obviously been tidied. Bao Zhan used tweezers to extract the hair from a brush.
Just use a magnifying glass to tell that there are four types of hair on the brush.
This means that four people once slept in the same bed.
Besides the deceased couple, who are the other two people?
Hua Long looked at the big bed in the bedroom and said: It's too obscene, four people sleeping together.
Professor Liang said: Xiaomei, check their computers.
Su Mei moved her wrist and said: In your eyes, this is a computer; in my eyes, it is a sponge. I want to squeeze out all the water in this sponge, leaving not a drop.
A lot of jaw-dropping information was found on the computers of the deceased couple. They joined a couples exchange club. This club has its own forum and QQ group, which is divided into multiple sections by region. In the city where the deceased couple lived, VIP members
There are more than a dozen people.
Su Mei sneaked into the QQ group where the deceased couple belonged. The group leader was discussing a weekend party. Su Mei did not say anything or provide photos, and was soon kicked out. Professor Liang asked Su Mei not to act rashly, as the murderer might be hiding there.
In this QQ group.
Bao Zhan said: It would be better to catch them all while they are gathering.
Su Mei agreed with Bao Zhan's idea. She suggested: We can pretend to be a couple, sneak into this club, and attend the party.
Professor Liang said: The murderer has just killed someone and may not necessarily attend the party, but he can exclude other suspects and narrow the scope.
The VIP membership verification of this wife-swapping dating club is very strict. New members must show a photo of the couple and a copy of their marriage certificate. The police decided after research that Hua Long, Su Mei, Bao Zhan and the female forensic doctor pretended to be two couples and sneaked into this wife-swapping club.
Dating club, undercover investigation. They showed forged photos and scanned copies of marriage certificates to join this couple exchange QQ group.
There are still a few days until the weekend party, and members of the group are looking forward to this wife-swapping party. The group leader said that she signed up
There are already five couples, plus the two new couples, a total of fourteen people, engaged in a promiscuous melee. This is a rare opportunity, and the other couples are encouraged to join.
The group leader’s online name is Soul Pact, and the group leader’s wife is also the group administrator, called Mrs. Hongxiu.
Hua Long is called Dragon Warrior in the group, Su Mei is called Mei Jiaren, and Bao Zhan’s online name is Baozi.
The female forensic doctor was very excited and active in the group. She gave herself a coquettish and delicate name: Little Soft Girl.
Block the QQ number and intercept a chat record:
Little soft girl??9:21:54
Asking for support will warm the bed.
Low-key_man??9:21:59
How old are you and have you ever exchanged before?
Little soft girl??9:22:03
I beg for licking my face, I beg for rubbing my breasts, I beg for being together, I beg for being ravaged.
Fire Phoenix??9:22:14
Haha, little sister is so direct.
Soul Covenant??9:22:17
Where is your husband? Look at your video.
Little soft girl??9:22:22
Please, I'm at the company and my husband is at work, haven't I verified it? I hate it, hate it.
Mrs. Red Sleeves??9:22:50
Lustful husband, let's watch it on the weekend. The little soft girl looks better when she takes off her clothes, hehe, let's see how many cuckolds I can wear on you.
Low-key_man??9:22:58
Mei Jiaren, are you there?
Mei Jiaren??9:23:02
oh.
Low-key_man??9:23:58
Video, look at you, why don't you post more sexy photos in black stockings. Mei Jiaren, you are so beautiful, drool, haha, I can't believe that a beauty like you will attend our party. When the time comes, I want...I won't
I will take pity on the fragrance and cherish the jade.
Soul Covenant??9:24:11
Haha, Mei Jiaren is mine, and so are Little Soft Girl and Fire Phoenix. I want to hug you from left to right, keep a low profile, and you can go play with my wife. My wife is very romantic. If you don’t believe me, ask someone in the group.
man.
Mei Jiaren??9:24:56
Huh, aren't you afraid of my little boots? They will hurt when you kick them.
Dragon Warrior??9:25:01
What are the rules for our party?
Little soft girl??9:25:06
I have played it once before, but there were not so many people.
Mrs. Red Sleeves??9:25:11
The samurai is Mei Jiaren's lover, right? If there are many people together, there are no rules. Whoever you want to play with can be dragged over to play. The prerequisite is to wear a raincoat and have fun. It's so exciting. I see you
Photo, very handsome.
Fire Phoenix??9:25:16
I also want a handsome guy. I have only played with four people.
Baozi??9:25:18
Hello everyone, the little soft girl is my wife. She is not usually like this. I was dragged here.
Soul Covenant??9:25:24
What are you trying to grab? I am the group leader. I will choose first. You can just watch my performance first.
Mei Jiaren??9:25:26
Hum, I want to choose you. I choose men. If I don't like them, I will kick them away with my little boots. If I like them, I will hook my fingers.
Low-key_man??9:25:36
Mei Jia is really like a queen, cold and cold, my wife and I are willing to be your husband and wife slaves, kneeling under your black stockings and high-heeled boots. You have your hands on your hips, holding a whip, arrogant and cool, arrogant, that's me.
The queen in my heart, my wife, come and pay homage to our charming queen.
Tender dream exchange??9:25:43
Hello, Mei Jiaren, queen, we and my wife are willing to serve you.
Mrs. Red Sleeves??9:25:48
Haha, you are really not low-key and tender. Have you betrayed me again?
Little soft girl??9:26:08
Take slaves, I will take slaves too.
Soul Covenant??9:26:12
Me, I haven’t been a slave yet, haha.
Mei Jiaren??9:26:19
I'm tired, so I'll get off first.
Little soft girl??9:26:20
I'm really looking forward to the wife-swapping party at the weekend. I'm really looking forward to it. Just thinking about it now makes me excited.
