Controlled experiment

Chapter 3

"Last month, my mother called me and said that she had taken a fancy to a diamond ring at an overseas auction. It was not big, but the workmanship was fine. She liked it very much. You have to take a model of this diamond ring before they place an order for you. Doing it is similar to the meaning of paying a deposit when we make a custom order. After paying the money, we have to wait three or four weeks, but my mother didn’t take pictures and was snatched away by a compatriot. She has been calling me these days with resentment nagging."

Qin Yan interrupted him with a dark face: "If you want to show off your wealth, you can rest."

Du Yusheng tilted his body and said: "This is the main point I want to say. I saw this diamond ring in Mrs. Luo's hand today. According to Mrs. Luo, he has been with Luo Daheng for the past few days. , but the diamond ring was produced from the auction until it returned to China, let alone a month, I just checked the calendar, Mrs. Luo should have only returned to China for two days, she was not with Daheng Luo at all."

"...What do you want to say? The exit record is easy to check." Qin Yan said: "What's the point of Mrs. Luo telling this lie?"

"I just want to say that they have a good relationship as husband and wife." Du Yusheng raised his eyebrows and said, "You said that Mrs. Fu changed her ways and told me why she and Luo Daheng are so affectionate, and it's not that the auntie of the neighborhood committee cares about such shit to solve the case. "

Qin Yan got to the point.Said the butler's name.

"Yes." Du Yusheng snapped his fingers: "The potted plants outside Luo Daheng's house are all made of red soil from Yunnan. The housekeeper should have renovated it not long ago in the morning. When we saw the housekeeper for the first time in the house, his shoes The shoes are all red and dirty, but when we came out of the house and met him at the door for the second time, standing with Mrs. Luo, his shoes were clean again. Why? I found it on Mrs. Luo’s little finger wiping tears. Yunnan red soil powder, so Mrs. Luo should have had intimate contact with the housekeeper’s shoes.”

"...Don't shine shoes?" Xiaobai showed disbelief: "This is too ambiguous..."

Du Yusheng put on airs and pondered for a moment: "Anyway, I touched it."

=============

On Wednesday afternoon, the original weekly meeting was canceled due to a murder case, and everyone in the team was in the conference room, staring wide-eyed.Today is a rainy day, and this kind of day is most suitable for sleeping at home covered with a quilt. Du Yusheng was still sleepy when he got up early, and he was still bleary-eyed during the meeting. He yawned countless times and leaned against the marble behind him On the board, he looked like he was paralyzed, his eyes were staring blankly at the screen in front of him, and Qin Yan was sitting next to him, watching his teeth itch.

"Luo Daheng, male, 50 years old, a native of Huandao City, yesterday morning, his housekeeper found that the antihypertensive medicine left at the door the day before had not been taken, and then found that Luo Daheng died in his study. After investigation, the crime scene There was no loss of property, no signs of fighting, and no signs of strangers entering or leaving. I checked with the neighbors around the villa, and I didn't hear any shouts or strange noises from Daheng Luo's house that night." Xiao Bai changed A photo: "Footprints of three people were found at the scene of the crime, namely Luo Daheng's housekeeper who came to the villa before his death, his illegitimate son, and the family doctor. After comparing this with the surveillance video at the door, we also got it." confirmed."

Du Yusheng yawned from behind, and raised his chin lazily at Qin Yan.

"Let me tell you about our situation." Qin Yan stood up and took the infrared remote control to draw circles on the screen: "Luo Daheng suffered from high blood pressure, heart disease and bronchial asthma, and these three types were also found at the scene. Medicine. Two bottles of albuterol, one full and one full. Although the nitroglycerin bottle is empty, I found traces of the medicine under Luo Daheng’s tongue, but it is not nitroglycerin, but a common cold medicine.”

"...The medicine was replaced by someone." Xiaobai frowned, writing notes in his hand: "So he didn't take the medicine in time and died?"

"That's the problem." Qin Yan pointed to Du Yusheng: "As Du Yusheng thought, Luo Daheng didn't die from not taking the medicine in time, but from taking too much nitroglycerin."

Du Yusheng squinted his eyes and smiled at Qin Yan, drawing a circle around his mouth, very proud.

Before Luo Daheng died, he had bruises around his mouth. This is called methemoglobinemia. Apart from heredity, it is most commonly caused by excessive nitroglycerin.Lead to human red blood cell hypoxia, and then cause oral mucosa and skin bruising.

Xiaobai was obviously a bit behind the scenes: "I heard that nitroglycerin saved people, but I didn't expect it to kill people? So it was really homicide?"

"More than that." Qin Yan changed the picture: "We found another thing in Luo Daheng's stomach."

A white ball of paper was wrapped in a transparent bag, the whole is very small, no more than the size of a fingernail, and the paper ball in the plastic bag was neatly folded into a square. Due to the protection of the outer plastic bag, the paper ball was not received any damages.Qin Yan glanced in Du Yusheng's direction, and then changed to the next picture.The paper ball in the plastic bag was opened, with black and white characters on it, and four bold characters printed in Song Dynasty on it, as a control experiment.

Du Yu stood up vigorously, took a few steps forward and looked at the picture, feeling his mind buzzing.The words on the picture, Times New Roman, typeface, can't make out anything from the handwriting.A square piece of paper, with four characters from top to bottom.Du Yusheng felt that he woke up suddenly, more energetic than drinking coffee.

"Are there any fingerprints on the paper?"

Qin Yan shook his head: "On this note, there is nothing of value except for these four words."

No matter from the cause of Luo Daheng's death or from this note, Luo Daheng died of homicide, and it seems that he was not a natural death as previously thought.Du Yusheng stood by the window and looked at the four characters and sighed deeply. There was something indescribable in his eyes. Xiaobai looked at it from a distance and felt that he couldn't read it.

===============

After the meeting, Du Yusheng stayed in his office and did not come out.The blinds of his office were drawn, and Xiao Bai couldn't see anything outside. It had been several hours, and he hadn't even gone to the toilet. Xiao Bai was really worried about his bladder.

Sooner, Qin Yan came to look for Du Yusheng.When he came to the door, Xiaobai stopped him.

Pulling people aside: "Brother Qin, Brother Yu hasn't come out all afternoon, this case...is it very difficult?"

Qin Yan laughed: "Your brother Yu never wastes his brain on these things."

Xiaobai didn't believe it, Qin Yan led him into Du Yusheng's office without knocking on the door.

Du Yusheng was still the same, staring at his computer screen very intently, quietly like a statue.With his fingers resting on the mouse, Qin Yan glanced down, and Du Yusheng's throat trembled up and down following the rhythm of the mouse.Qin Yan and Du Yusheng have been good buddies for many years. Sometimes Qin Yan feels that he is a straight man, but when he sees Du Yusheng concentrating, he feels that he is bent. When he returns home from work, Qin Yan feels that he is straight again. In the past few years, even Qin Yan himself couldn't tell.

There were still three dry cups on the table. Qin Yan rolled up his sleeves and threw the cups into the nearby sink naturally, and turned on the faucet skillfully.

"To give me the autopsy report?"

The sound of the faucet was so loud that it almost covered Qin Yan's voice, only to hear a low acknowledgment from the other side: "It's at Xiaobai's place." Turning to Xiaobai, he said, "Xiaobai, show him. "

Du Yusheng took it and turned two pages, then put it aside, and returned his eyes to the computer screen.

Xiaobai blinked, couldn't sit still, and said, "Brother Yu, what is a controlled experiment?"

Du Yusheng was busy with the matter at hand, so he didn't bother to pay attention to him, so he sent away: "Just take a flashlight, it's dark, and take a picture of the experiment."

"..."

Qin Yan couldn't stand it anymore, and took over the words: "Generally, when conducting some kind of experiment to clarify the influence and treatment effect or significance of a certain factor on an object, except for the research factor or operation treatment required by the experiment, other factors should be consistent. , and compare the test results.

Xiaobai didn't say a word.

Du Yusheng rolled his eyes: "Be clear, he doesn't understand."

Qin Yan put the cleaned cups back in Du Yusheng's cabinet and put them in order.

"Let me give you an analogy. If you want to use Du Yusheng as an experiment, then you need to find a model that is exactly the same as him, regardless of the appearance, height, weight, and other conditions, and then change one of them. conditions to achieve your experimental goals..."

Qin Yan's voice became softer as he spoke the second half of the sentence. He looked at Du Yusheng, and he wanted to think of something.

That anonymous email.

twin.

If people are compared to animals, twins are undoubtedly the best model for controlled experiments.

However, the person involved, Du Yusheng, didn't seem to notice anything. His mouth was stuffed, and it was the cherry that he brought over last time.

Xiaobai stretched out his head and glanced at his computer: "Brother Yu... have you been busy with this all afternoon?"

On the computer screen is a photo of Du Yusheng. Last month, he solved a high-profile case. The bureau praised their team and specially wrote a small composition to be circulated around the world to praise Du Yusheng. The photo of Du Yusheng was placed with others , is a group photo.

Du Yusheng clicked the mouse and frowned: "Next time, talk to the publicist about making my photo bigger. Here, I have to P by myself. It took a whole afternoon and I didn't even go to the toilet."

Xiaobai watched Du Yusheng set that picture as his wallpaper, and didn't know what expression to use to look at him better.

"Oh, by the way, what's going on with the butler?" Du Yusheng closed the computer.

Xiaobai said: "Someone of them has gone, I guess there will be news later."

Du Yusheng nodded.Then he opened the autopsy report brought back by Qin Yan.

With his chin raised, Qin Yan said, "What do you think?"

Du Yusheng stretched out a finger: "I was thinking, how did you say that this nitroglycerin got Luo Daheng to eat it? I took the time to watch the surveillance several times in the afternoon, and I found that the last person who saw Luo Daheng was his family doctor, and The family doctor left the villa at 10:30, and Luo Daheng died in the early morning. In other words, if one of them fed Luo Daheng the medicine, then Luo Daheng would not die after so long. So I I feel like there's only one answer."

Du Yusheng paused for a moment, tapping his fingers on the table: "Daheng Luo ate the nitroglycerin himself."

Xiaobai touched his chin: "Poison yourself to death? Then it's suicide."

Du Yusheng didn't answer Xiaobai's wicked question, but looked at Qin Yan.

"Qin Yan, what do you mean that people will use controlled experiments?"

Qin Yan looked up and thought for a moment: "Many people use it, but they often use it... Biology majors, and, like me, medicine, I did it when I was in school."

Thinking of going with himself, Du Yusheng took out a photo from the drawer and pushed it in front of the two of them.

In the photo is a very handsome face, smiling slightly, wearing a white coat, the whole person looks clean and upright.

Qin Yan looked down, and the person's name was written under the photo.

Li Yao.

Luo Daheng's family doctor.