Cop Universe

Chapter 132 When solving the case

He Jiahui was also a police officer of the West Kowloon Police Station before, and Cheng Feng also invited him to join the serious crime team, so Cheng Feng had read He Jiahui's file and knew that He Jiahui had solved a poisoning case.

He Jiahui introduced: "It was in a bar. The scene was similar to here. There were also a few people gathering around a table. The murderer used wet wipes to poison.

He prepared poisonous wet wipes in advance and placed them in front of the deceased, and then deliberately bought greasy snacks. After eating the snacks, the deceased would wipe his hands with the wet wipes, and his hands would be stained with cyanide.

Then when eating, you need to pick up the snacks with your hands, otherwise cyanide will get on the snacks and be eaten by the deceased.

Since wet wipes are used for their own purposes and cannot be mixed, using this method also ensures that no innocent people will be harmed, and only the deceased will be poisoned. "

"Did the murderer use similar methods this time?" Cheng Feng asked.

"Then check the garbage!" He Jiahui looked around the table and found no trash cans, so he called the manager and asked: "Have you cleaned up the garbage on this table?"

The manager immediately replied: "If the guests have not finished eating, our waiters will not take the initiative to clean up the garbage. Under normal circumstances, we will only clear away the garbage when the guests have finished eating. All the garbage should be placed in the bone dish."

"In other words, all the garbage generated when eating is on the table." He Jiahui said and looked at Gao An.

Gao An shook his head and said, "When we tested everyone's tableware, we sampled the used paper towels and the garbage in the bone dishes, and no cyanide was found!"

After hearing the results of Gao An's report, He Jiahui and Cheng Feng's expressions froze at the same time.

The most important thing in detecting a poisoning case is to determine the source of the poison. Now that the source of the poison cannot be determined, the case cannot be investigated at all.

He Jiahui looked at the surrounding layout and said: "If someone poisons, the deceased's hands must be exposed to cyanide, but this is a hall, a public area, how can the murderer let the deceased touch it in full view of the public? Where’s the cyanide?”

"Could it be that he did it while he was dead in the bathroom?" Cheng Feng asked.

"If you go to the bathroom, you will definitely wash your hands when you go out. There can be no cyanide left on your hands." He Jiahui said.

"That's true, but if the deceased had stayed in his position, I really can't imagine how he came into contact with poisonous substances."

Cheng Feng pondered for a moment, then looked at Gao An, and then said, "Have the deceased's clothes been tested? He didn't carry cyanide on his body, right?"

"Of course we will not miss the deceased's clothes. His personal belongings and pockets were all tested. Only the collar was found to have some cyanide residue. But based on the location, it should have been in his mouth before death. It was caused by the saliva flowing out." Gao An answered.

"There is no cyanide on the clothes either, which is strange. When we come to eat, everything we touch is on the table. If there is no cyanide in everything on the table, then where did the cyanide on the deceased's fingers come from?" Cheng Feng frowned and said.

Hearing these words from Cheng Feng, He Jiahui suddenly realized. He said, "Sir Cheng, what did you just say?"

"I said that if there is no cyanide in everything on the table, then where did the cyanide on the deceased's fingers come from? Is there a problem with this statement?" Cheng Feng asked in confusion.

"There is a problem! There is a big problem!" He Jiahui continued: "You are talking about where the cyanide on the deceased's fingers came from!"

"Yes, that's what the forensic evidence just said. Cyanide was found on the fingers of the deceased." Cheng Feng said.

He Jiahui immediately looked at Gao An: "Is the test result what Sir Cheng said? Only cyanide was found on the fingers of the deceased, but no hydride was found on the palms or other parts?"

Gao An thought for a while before answering: "Except for the fingers, it is true that hydrides are not found in other parts of the hand."

"Where is the cyanide on the finger?" He Jiahui asked again.

"The cyanide mainly hit the fingertips," Gao An replied.

"In other words, no cyanide was detected at the nail position on the back of the finger?" He Jiahui continued to ask.

"No." Gao An paused and then said: "And the cyanide is mainly concentrated on three fingers, namely the index finger, middle finger and ring finger. The cyanide on the thumb is extremely trace, and it does not appear to be caused by direct contact with cyanide. It's more like a rub, and there's no cyanide on the little finger."

He Jiahui immediately spread his palms and said, "When we use our fingers in daily life, the thumb, index finger and middle finger are most often used. The least commonly used is the little finger, especially the tip of the little finger. Most of them are The situation is unused, so it is normal that there is no cyanide on the little finger.

But there is only a trace amount of cyanide on the thumb, which means that the thumb is not in direct contact with cyanide, which is not normal.When we use our hands, whether we are picking up, pinching, holding, or twisting, we cannot avoid using our thumbs in almost all actions.What kind of movement requires only the index finger, middle finger and ring finger, without using the thumb? "

Cheng Feng next to him looked at his hands, and then he answered, "It's picking! If you use picking, you shouldn't use your thumb."

Cheng Feng made a picking motion with his fingers as he spoke, and then said: "But is there anything on this table that needs to be picked with your hands? Did you drink cans of drinks?"

When a normal person talks about the action of "picking", the first thing that comes to mind is definitely not Mr. Taka Kato, but to pick a can with his fingers.

Several people shook their heads, and Du Qiusheng took the initiative and said: "We originally planned to go singing after dinner and then drink. So we didn't order wine, and everyone drank tea."

"I haven't opened the can! What else do I need to pick out..." Cheng Feng frowned and began to think.

He Jiahui said: "In addition to picking, you can also use these three fingers when pressing with your hands, such as this action."

As He Jiahui spoke, he walked to a clean round table next to him, stretched out his right hand, pressed it directly on the turntable of the round table, and then said:
"If I want to turn the turntable on the dining table, I need to reach out and press on the turntable, and this action will use the longer index finger, middle finger and ring finger. As for the shorter thumb, it is almost useless."

Cheng Feng made some gestures with his hands, and then nodded in realization: "You are right, this action does not use the thumb and little finger, and the index finger, middle finger and ring finger are all in contact with the turntable. , the palm of your hand will not touch.

This means that cyanide was on the turntable on the dining table, and when the deceased used his hands to push the turntable, the three hands came into contact with cyanide! "

Gao An next to him denied it, "Sir Cheng, when we inspected the dishes on the table just now, we also inspected the turntable, and no cyanide was found."

He Jiahui smiled slightly and asked, "You haven't detected cyanide on the front of the turntable, but have you tested the back of the turntable?"

"The back of the turntable?" Gao An was startled. He had never tested the back of the turntable.Ho Jiahui continued to explain: "The back of the turntable is a place that is easily overlooked, not only because the back of the turntable is not in our sight, but also because under normal circumstances, no one will touch it.

But in some cases, our hands will still touch the back of the turntable.For example, I want to turn the turntable, but the dish with vegetables has occupied the entire turntable, and there is no place on the front of the turntable for my hand to touch the turntable.

At this time, in order to be able to turn the turntable, I could only turn my hand over, reach to the back of the turntable, and use my fingers to hold the turntable to exert force, thereby achieving the purpose of turning the turntable.This action also uses the longer index finger, middle finger and ring finger instead of the thumb. "

"I understand, I'll check it right away!" Gao An immediately went back to check the back of the turntable.

After a while, Gao An brought the test results: "Sir He, as you guessed, we detected cyanide residue somewhere on the back of the turntable near the edge.

The area of ​​cyanide is about three centimeters by two centimeters, and there is also a fingerprint mark on it. We have compared it and it is the same as the fingerprint of the deceased. "

Cheng Feng immediately restored the whole process: "That is to say, someone applied cyanide to a certain edge on the back of the turntable, and then the deceased wanted to turn the turntable, and his hand happened to touch that place.

The chopsticks, spoons and teacups he touched later were also stained with cyanide. Later, when he was eating roast duck, he touched the cake with his hand and swallowed the cyanide into his stomach, resulting in death from the poison. "

The source of the poison has been determined, and the case has finally made progress. The next step is to investigate who is the poisoner.

"Now that the source of the poison is determined to be on the turntable, the scope of the investigation has been reduced a lot. The poisoner must be someone who has access to this dining table, so that he has the opportunity to smear cyanide on the back of the turntable."

Cheng Feng said, turned around and called the hotel manager, and asked: "Manager, how often do you clean the turntable on your dining table?"

The hotel manager immediately replied: "We will clean the table after every guest leaves, otherwise new guests will not be able to use it!"

"Then how did you clean it up?" Cheng Feng asked again.

"We have a professional cleaning agent. Spray it on the dining table and wipe it with a rag to remove the oil stains on it. Then use clean water and a clean rag to wipe the cleaning agent clean," the manager replied.

"The turntable above, do you only clean the front side, or the back side as well?" Cheng Feng continued to ask.

"The front of the dinner plate must be clear and clean. As for the back of the dinner plate, the circle near the edge must also be wiped clean. Because sometimes, vegetable soup or oil stains will flow onto the turntable, and then along the edge of the turntable, In order to ensure hygiene, we will wipe the edge of the turntable to remove the residue of vegetable soup when cleaning."

While talking, the manager walked to a table and covered it himself with the turntable on the table.

Judging from the manager's demonstration, the circle on the back of the turntable close to the edge is also within the scope of cleaning.

"Since each table of guests will clean the table and turntable again, if there is cyanide, it will also be cleaned. This means that the cyanide was applied by the people who ate at the same table."

After realizing this, Cheng Feng looked sharply at the other seven people eating at the same table, as if he wanted to see who among them was the murderer.

Then Cheng Feng walked up to a few people and said, "I'm very sorry, but our police want to search you. Men, please come over here, ladies, please come over there. We have female police officers."

When they heard that they wanted to recruit people, none of the seven people objected, but cooperated with the police very much.

However, nothing was found. No cyanide was found on any of the seven people.

This result is also reasonable. After committing the crime, it is impossible for the murderer to put cyanide on his body, flush the remaining cyanide down the toilet, and destroy the evidence without anyone noticing.

The case was temporarily deadlocked again. Cheng Feng stood there without saying a word. He carefully sorted out the facts of the case, but found that there were many doubts about the case.

So Cheng Feng said to He Jiahui next to him: "Sir He, do you think this poisoning case is a bit strange?"

"What do you think is strange?" He Jiahui asked.

Cheng Feng said: "Cyanide is coated on the back of the turntable, and it is not the entire back of the turntable that is coated with cyanide, but only a small area of ​​three centimeters by two centimeters.

In this case, if you want to poison the deceased, two conditions must be met. First, the deceased needs to actively reach out to turn the turntable, and second, the deceased's hand needs to just touch the place coated with cyanide.

Isn’t it a bit difficult to satisfy these two conditions at the same time?If the deceased had no intention of turning the turntable at all, or if the deceased did not touch the area coated with cyanide when turning the turntable, then he could not have been poisoned. "

"You also noticed this!" He Jiahui nodded slightly, and then said; "So I have been thinking about this issue for a long time.

Judging from the murderer's method of committing the crime, it is not difficult to apply cyanide on the back of the turntable somewhere near the edge. It can be done at any time as long as you are sitting at this table.

But the randomness of letting the deceased touch the cyanide-stained area is too small. Three centimeters by two centimeters. This area is too small. How lucky is it to just touch there?So I think there must be details that we haven’t discovered yet! "

He Jiahui said, and said to Gao An next to him: "Gao An, where are the photos taken at the crime scene? Show me again."

Gao An nodded and handed the digital camera to He Jiahui.

He Jiahui took the digital camera and looked at the photos inside, carefully reading each one.

Suddenly, one of the photos caught He Jiahui's attention.

The exhibit number next to this photo was 7, so He Jiahui immediately asked: "What is exhibit No. 7?"

"Let me check." The high-security evidence grade table looked at it, and he replied, "Evidence No. 7 is the deceased's dinner plate!"

Hearing this answer, He Jiahui narrowed his eyes slightly, and he already had a guess in his mind.

　I'm sorry it's late again, I had a stomachache all night yesterday, I didn't go to bed until dawn, and I made up sleep during the day.

　　
　
(End of this chapter)