teach me how not to be the police

At nine o'clock in the evening, the meeting will be held on time.

The meeting was chaired by Director Zhang. After a brief opening speech, he went straight to the topic and said:

"The technical team will first report on the site survey."

Team Ko said:

"At the scene of the two cases, we divided into two groups to investigate separately, one group was dominated by Captain Zheng, and the other group was dominated by Captain Li. Our detachment was also divided into two groups to investigate together.

Since Captain Zheng and Captain Li had inspected the two injured before we came, Captain Zheng will report on the inspection, and I will report to our group. "

Team Ke looked at Captain Zheng, who nodded and said:

"Combining the examination of the two injured by the forensic doctor Lao Cai, let me introduce the injury situation.

Huang Yuying's injury was located on the right side of the chest. It was two parallel lines with a length of 7.5 cm. A single scar was 2 cm wide and 0.1 cm deep. The distance between the two scars was 5 cm. Outside, heavy inside and light outside.

Huang Rongzhi's injury was located at the root of the right thigh, with a length of 5 cm. The single scar was 2 cm wide and 0.2 cm deep. The distance between the two scars was 5 cm.

In addition, after the forensic examination, the two wounded were both raped. The forensic doctor Lao Cai had already made a blood type, which was the same as before, and they were all type B blood.

The injuries of the two injured persons were roughly the same as those in the previous case, both of which were two parallel scratches.Moreover, the distance between the two scars is 5 cm. The difference in depth is due to the magnitude of the force, which does not affect the entire analysis and judgment.

Therefore, these two cases can be investigated together with the previous cases. "

Team Ke went on to say:

"Our group is investigating Huang Rongzhi's house. His house is located on the west side of Huangnitan Bay in Baisha Village. It is a three-room house, facing south, with a main room in the middle and one room on each side of the east and west sides. The accident site It is located in the west room. That is, Huang Rongzhi's room. This is the central scene.

There are few items in Huang Rongzhi's room, and the furnishings are relatively simple. There is a table under the south wall and a wardrobe in the southwest corner.There is a chest of five drawers under the west wall.There is a bed in the northeast corner.In front of the bed, that is, on the south side, there is a low cabinet against the east wall. The ground is dry and hard soil, and the layout of the whole room is like this.

Trace evidence.Not very well handled.No trace of the perpetrator was found on the indoor and outdoor grounds, and the conditions at the scene were too poor.Fingerprints, no.Only a gray fibrous object was extracted from the lock of the door on the east side, which is more likely to be a rope.At the latch of the back door, we found 6 dot-shaped traces and no less than 8 line-shaped traces. After analysis and research by Captain Zheng and I, and field experiments, we can be sure that it was formed by scissors, that is to say, the crime The person took scissors and opened the back door latch to enter the room.

The whole process of committing a crime is analyzed as follows:

The perpetrator used scissors to open the door, closed the door on the east side with hemp rope, entered Huang Rongzhi's room, dropped the light bulb in the room, and stunned Huang Rongzhi with a special tool. Form scars, and then commit rape. After committing the crime, take away the light bulb, remove the rope, and still escape through the back door.Simply put, the back door goes in and the back door goes out.

As for the work of combining cases, Captain Zheng has already introduced it just now, so I won't repeat it. "

"This is the conclusion of your investigation all afternoon?!" Ai Detachment asked, obviously he was very dissatisfied.

"Team Ai, the objective conditions on site are really poor, we have worked hard." Captain Ke replied.

"Huang Rongzhi was injured at the root of her right thigh. When she was knocked out, did she sleep with her underwear on or without her underwear?" Team Ai then asked.

"This, this... I didn't ask the victim. When I came, the inspection work had been completed, so I didn't meet the victim." Team Ke stammered.

"You are on the scene of the investigation, you are from the city bureau, and you are the general person in charge of criminal technology in the city. After the case happened, in some cases, if you don't ask the victim yourself, you don't do it yourself, can you figure it out?! Dongyang The comrades of the county bureau have finished the inspection, can't you check it again?!" Ai Detachment was a little angry.

Ai Detachment asked one sentence after another, one question after another, and finally it became a questioning, which made the technical staff very nervous, Xiao Cao looked at me with panic, and the others were even more frightened. Dare to make a sound.

Team Ai showed no signs of stopping, but continued:

"Finding out this question, do you know how important it is for our investigation?! If the victim slept with his clothes on, and there were no such marks on the clothes, it means that the perpetrator took off the victim's clothes and then used a tool Hurt. These two big living people are both in their teens. How can they not know when others take off their clothes?! Knowing, it is possible to see the face of the perpetrator clearly. It has taken a big step forward. If you don’t solve these important problems in your on-site investigation, do you ask the field investigators to solve them? Do you ask our command personnel to solve them?!”

Director Zhang hurriedly divided the cigarettes and Ai detachment, the Ai detachment took the cigarettes and put them on the table without lighting them, but looked at the Ke team, the Ke team lowered their heads and dared not make a sound.

I know that these problems are indeed the problems we need to solve in the on-site investigation. The real reason for the Ai detachment's anger is that the scene did not extract anything that could reveal and prove the crime. It is definitely more difficult to solve the case without the support of technology. He is taking Technology cuts.

Director Tang quickly changed the subject:

"Captain Li, your group will report the investigation situation."

I nodded and said:

"Our group is called Xiao Cao Report."

There was a sound of "Oh" in the meeting room, and Xiao Cao's face was even redder.

"Captain Li, you asked a policeman to report such a big case? Why didn't you report it yourself?!" Ai Detachment, whose tone softened slightly, was enraged again and asked.

"The scene of this case was investigated by Xiao Cao, so he reported it." I replied.

"What? What did you say?! Such a big case. You called a technician to lead the survey?! Then what does your person in charge do?!" Team Ai was furious.

"Team Ai, you may not know that since this year, our technical team has carried out a comprehensive reform. Every technician is a generalist. We only talk about results, regardless of their positions." Director Zhang explained hurriedly.

"Really? Then I'd like to hear about the results of your comprehensive reforms." Ai Detachment picked up the cigarette on the table, lit it, and smoked.

I nodded heavily to Xiao Cao, and he nodded to me too.Then stand up.said:

"Leaders, I will now report on the investigation of our group."

"Xiao Cao, don't be nervous." Director Tang said.

Xiao Cao nodded and said:

"Thank you Director Tang.

The home of the victim, Huang Yuying, is located in the middle and east of Huangnitan Bay.It is an old-fashioned house with five rooms.Sit north and face south.There are eight rooms in total.There are 1.5 meters of roadways on the east and west sides that are separated from other houses. These two walls have no doors or windows, so.It can be ruled out that the perpetrator used this place as an import and export.

There are four and five windows on the north and south sides respectively, all of which are wooden and small and medium-sized windows. None of the nine windows have obvious signs of prying damage. Therefore, entering the room through the windows can also be ruled out.

The roof is covered with blue tiles, and there are no holes, gaps, or signs of freshness on it, so the possibility of entering the house from the roof can also be ruled out.

Judging from the exclusion of the above aspects, the perpetrator can only enter the room through the front and back doors.We interviewed the victim and his mother, and they all reported that they went to the hospital after opening the front door. We checked the front door repeatedly. The front door was a thick wooden door. There are no obvious signs of prying, damage, etc. at the door and door shaft, so the possibility of committing crimes through the front door can be ruled out.

For the rest, only the back door is left, and the back door is a split wooden door.

We conducted a detailed survey, inspection, and test on the back door, and found that the gap between the door shaft and the wall is 3 cm wide, and fingers can be inserted into it. After our tests, it is difficult to forcefully take the back door open, but it can still be taken. of.In other words, it is possible to break into the house.

This is not the key point. The key point is that we found 7 dots and 9 line traces on the latch. These traces are relatively fresh, and the reflection is strong when viewed against the light.Moreover, there is a 2CM gap between the two doors, which can accommodate small items to enter.Combining the two, we determined that the perpetrator's method of entry was to use scissors to pull the latch to commit the crime. Combined with the situation at the front door, we have reason to infer that the perpetrator fled the scene through the back door.In other words, the perpetrator entered through the back door and exited through the back door, which is the same as Captain Ke's method of committing the crime.

The perpetrator's activities in the room were basically the same as Captain Ke's introduction, such as locking the door behind him, turning off the light bulb in the room, taking it away with him after committing the crime, and so on.I won't repeat it, the focus of what I want to say is the trace evidence.

First is the footprint.We found a footprint in the gutter of the back door. This footprint is very fresh. A very favorable condition is that Huang Yuying’s kitchen is next to the back door. Usually a lot of dirty water is poured at the back door, so the ground is relatively relatively clean. Moisture provides objective conditions for the legacy of footprints.

Next, we will solve the problem of why this footprint is the perpetrator.

Huang Yuying’s family currently only has her and her mother at home. We have looked at the shoes they are wearing, and we have also looked at all the shoes in her family, but they do not match. Therefore, it can be ruled out that she and her family stayed here. down.

The second point is that the location where the footprints are located is in the gutter. This location is quite special, and ordinary people will not leave footprints here when they walk normally.

Third, judging from the pointing of the toes of the footprints, the toes point to the direction of the outside. Combined with the fact that the footprints are very fresh, it is certain that they were left by the perpetrator. It was too late to take a closer look, so I panicked and stepped into the gutter by mistake.

More importantly, when Captain Li took us to search the periphery, we also found this kind of footprints in the mud next to a puddle on the mechanical farming road out of the bay. The black soil is also present.

According to this analysis, after the perpetrator escaped from the scene of the center, he left along Jigeng Road and then onto Dongtong Highway, and it can also be inferred that the perpetrator walked on foot and had no means of transportation..."

"Xiao Cao, speak slowly, don't rush." ​​Team Ai lit another cigarette and said with a smile.

"Thank you Team Ai." After Xiao Cao finished speaking, he continued:

"After solving the route to go, we need to solve the route to come. According to our survey and analysis, we believe that the route to go is the route to come. The reasons are as follows:

Huang Yuying's house is located on the east side of Wanzi, and it was discovered at about [-]:[-] am today, while Huang Rongzhi's house is located on the west side of Wanzi, and it was discovered at about [-]:[-] am today. The two families are in order of time , combined with the distance from Dongtong Highway, it is very consistent with the above conclusion.In addition, there is one point of proof that Jigeng Road leads westward to Simao Bay in the same village and ends, that is to say, it is a dead end.

After solving the route of the perpetrator's coming and going, we still return to the traces and evidence at the scene.Xiao Ke, please show the plaster molds of the footprints on site to the leaders and comrades. "

Xiao Ke immediately left his seat and showed everyone the footprints. Xiao Cao took the opportunity to drink water, and after reading all the footprints, he continued:

"This is the footprint of a Jiefang shoe, which is relatively incomplete, only the forefoot part. After comparison by Captain Li, it was compared with the sock print extracted from the scene of Zheng Xiumei's rape case in Zhengjiawan, Zhengjiawan, Bating Village, Tongkuang Village on '1997.05.24' The palm width is relatively consistent, and there is no obvious difference in principle.

The second trace is blood.I also introduced just now that Huang Yuying's house has eight rooms of different sizes. We found spots of blood on the bed in the east outer room, but not in the other rooms. From this, we identified the center site.The blood should have dripped on the bed sheet after the victim was injured.

On the bed, we found not only blood, but also hair.There are two types of hair, one is about 15cm long, which is consistent with Huang Yuying's hair length and color; the other is about 5cm long, short and straight.After Captain Li and I reviewed the victim, she reported that she had been sleeping alone in the bed for a long time.Therefore, it is certain that the short hair was left by the perpetrator.

The fourth is fiber, which is basically the same as what Captain Ke introduced.

That's all I have to say, thank you leaders. "

After Xiao Cao finished speaking, he sat down.

"Ai Detachment, how do you feel?" Director Zhang asked with a smile.

"Haha, I really didn't expect that your technical team in Dongyang County has changed so much. No matter whether the conclusion analysis is correct or not, a small technician can analyze it clearly and logically. It's very good! Very good! That little Cao, what's your name?" Team Ai asked.

"Report to Ai Detachment, my name is Cao Tingbao." Xiao Cao hurriedly stood up and replied.

"Sit down, sit down." Team Ai raised his hand and pressed down.

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