Chapter 72 Fighting Fire with Fire
Du Yu said: "Both cups are poisonous, that means the wine is poisonous."
The laboratory technician said: "Captain Du, we have tested the wine bottle and it is not poisonous."
Du Yu heard this and said: "So [the cleaner] poisoned all the cups? This way Song Lang will not get the wrong cup."
After saying that, he frowned. If this was the case, it would be a poisoning incident of extremely bad nature.
If the nightclub hadn't closed last night, many people might have died!
The more I thought about Du Yu, the more scared I felt, and at the same time, I became more and more stressed.
The police are not gods. Even if Jiangcheng police work 24 hours a day and can prevent 90% of homicides, they cannot prevent potential poisoning crises.
There are many examples of assassinations of presidents and top wealthy businessmen in foreign countries. There are always times when the enemy is hiding from the enemy and we are clear, and we are always negligent. What's more, poisoning is more concealed and easier to escape than using a murder weapon.
The laboratory technician heard this and explained: "We have also tested the other empty cups and found nothing. In fact, only the two cups that had been filled with wine were poisonous. It does not mean that all the cups have problems."< br>
Du Yu was stunned, "Only the two cups used by you, Director Xu, and the deceased were poisonous, and there was no problem with the wine? How did the murderer determine that they would definitely use those two cups?"
For a moment a very crazy idea flashed through his mind.
The one who doesn't know how to poison is Song Lang himself!
Zhou Shi didn't bother to discuss this, but turned to look at Xu Yiqing, with worry on his face: "Is it okay? Go to the hospital."
Xu Yiqing shook his head: "More than ten hours have passed. If I were to die, I would have been lying in the next room with Song Lang, and then Ah Sheng would dissect me with a sad face."
When Lin Sheng heard this, his expression suddenly fell. Brother Xu was both a teacher and a friend to him. If something happened, he would die of pain.
"Brother Xu, don't say such unfavorable words. I'm really afraid that something will happen to you."
Seeing that his face was really full of worry, Xu Yiqing was a little relieved and made up her mind not to make such a joke again.
Zhou Shi was still worried: "You said that due to the toxicity of aconitine, Song Lang would die within half an hour, but it still took two hours for him to have an attack... Just in case, it's better to go to the hospital for a check-up." OK.”
The laboratory technician answered at the right time: "Actually, the poison found in this test is somewhat different from the composition of aconitine."
Du Yu touched his forehead and felt troubled: "Now even the poison in the cup is different from the poison analyzed by Director Xu?"
He trusted Xu Yiqing's judgment, so he did not suspect that the autopsy was wrong.
Xu Yiqing also looked at the laboratory technician. How could it be possible that the poison was wrong?
There will be no problem with Song Lang's blood test. After all, it was taken from the heart of the deceased and cannot be faked.
Upon seeing this, the laboratory technician knew that everyone had misunderstood, and quickly said: "There is indeed an ingredient of aconitine... but it is not just aconitine. Because it is mixed with some other things, all the indicators are abnormal. Director Xu, look Let’s look at the report. Our laboratory department’s opinion is that aconitine is impure or is a compound toxin.”
He is just a small clerk in the forensic department... In fact, it's not just the forensic department, it's the same everywhere. The leaders make the decisions, and the people below are only responsible for explaining the facts.
Although Lin Sheng is currently in charge of the Forensic Medicine Department, everyone knows that Lin Sheng's qualifications are too junior, so even if Xu Yiqing resigns and will only be a consultant, you should still listen to him.
"I know, let's see."
"Then I'll go and get busy. Call me if you need anything."
Xu Yiqing turned on the computer in the office. In the office software, there was a report document just sent from the laboratory department.
Du Yu also leaned over to take a look. At first glance, this report looked a bit like his own physical examination report. After the blood test, there would be these indicators that he could not understand. As for any abnormalities and what caused them, he had to register. Went to ask the doctor.
It doesn't matter if you don't understand it yourself, Xu Yiqing can be said to be omnipotent in terms of forensic identification.
"It can't be wrong. Although some data are not obvious, it should be aconitine." Xu Yiqing said: "Aconitine is very easy to hydrolyze. There was liquid left in the glass after drinking last night. , after more than ten hours of hydrolysis, it is normal for the data to be unclear, but..."
Xu Yiqing greeted Lin Sheng: "Asheng, come and see, in addition to aconitine, there are data abnormalities in other compound components. What do you think it is?"
Lin Sheng scratched his head and began to recall the pathology knowledge he had learned before.
"The content of histidine is relatively high. Histidine is also a kind of alkaloid... It is some kind of neurotoxin, right? However, this type of toxin is a nitrogen-containing ring structure, which is generally stable and will not hydrolyze or heat. Dissolving, there is no decrease in content over time, so just talking about the dosage in the report, let alone poisoning people, at most they will make their tongue numb and their speech unclear.”
Xu Yiqing frowned: "The neurotoxin, aconitine, delayed its onset for several hours after poisoning..."
He felt like he was about to catch something.
Xu Yiqing was always the one who studied most seriously during his graduate studies. He rarely had fun or played games in his spare time. He spent most of his time in the library, reading through typical forensic cases from ancient and modern times at home and abroad.
He seems to have seen this situation before...
Yes, there must be a similar case. Xu Yiqing believed in his memory.
"Let me check the information." Xu Yiqing said: "My brain is not as good as yours. Why is it that the cup was poisoned but Song Lang died but I was fine? I will leave it to you to think about. I will concentrate on investigating what I am good at."
After that, he opened the Baidu interface and tried to think about the books and cases he had read at that time.
Going to graduate school was already ten years ago.
No matter how good your memory is, it is difficult to remember the specific content of a book you read ten years ago.
"Why were aconitine and another neurotoxin detected in the cup, but only aconitine was detected in Song Lang's body?"
While muttering, he entered the two keywords aconitine and neurotoxin into the search bar and began to browse through the news reports over the years.
Time passed by. Zhou Shi and Du Yu were discussing all the details of last night. Lin Sheng was listening silently. Occasionally, when asked, he would give some opinions from the perspective of a bystander, but most of the time it was them. The two are discussing.
Or to be precise, it was Zhou Shi's analysis. Du Yu nodded while listening.
Zhou Shi started pacing in the office again. She closed her eyes and took on the role of the murderer, sketching possible situations.
In the blink of an eye, it was already noon. The other three people had been discussing for nearly an hour, and Xu Yiqing had read the information for an hour.
Suddenly, an idiom that appeared in the keywords on the web page caught his attention.
Fight fire with fire!
"This is it!"
Xu Yiqing showed a look of joy. He clicked on the web link and clenched his fists when looking at the news reports inside: "I found it. Come and take a look."
The other three people came over to watch. Du Yu looked at the news headline and whispered: "Japan's most genius serial murderer, whose three wives died of myocardial infarction?"
Lin Sheng discovered the blind spot and said: "Myocardial infarction is the same as Song Lang's death."
Zhou Shi looked at the time the case occurred in the report: "1986, a case of the last century."
Xu Yiqing said: "Because of the age and underdeveloped technology a few decades ago, many poisons could not be tested at that time. In addition, Japan's forensic identification has limitations. An autopsy requires the consent of the family, otherwise the police will not have the power to dissect the deceased. Therefore, many cases are said to be somewhat mysterious.”
After a pause, he continued: "Actually, this case is very simple. The cause of death was aconitine poisoning. The husband killed his wife and defrauded the insurance company and forged his own alibi... because aconitine poisoning could take five minutes at the earliest and half an hour at the latest. There was an attack, and the wife died of the poison two hours after the husband gave her the medicine. Therefore, the evidence chain is insufficient and there is no way to convict.”
In 1986, her husband Riki Kamiya and his wife Kurisako traveled together with three of his wife's friends.
On the way, the husband used the excuse that the company had an emergency to fly back to China. Before leaving, he forced his wife to take a so-called vitamin pill.
Two hours later, while playing with friends, my wife suddenly opened her eyes wide and knelt on the ground, clutching her chest. Her expression was painful, her head was sweating, and her face turned pale.
The friend was frightened and quickly called the emergency number, but before the ambulance arrived, his wife was already dead.
From the onset of discomfort to death, it only takes five minutes!
The final death report issued by the hospital was natural death due to myocardial infarction. The friend insisted that the husband poisoned his wife. After all, anyone would think there was something wrong with the pill.
However, due to limited technology at the time, it was impossible to detect neurotoxin residues in the deceased's body. The case was not overturned by a professor until four years later.
The professor in charge of the autopsy at that time retained 30 ml of the heart blood of the deceased. After technical iteration, the component of aconitine was detected, thus confirming that the wife was murdered by her husband and did not die naturally.
After listening to Xu Yiqing's summary, everyone present understood something.
"It's very similar to Song Lang's death."
"Died of aconitine poisoning, but the onset of the poison was delayed by two hours."
Zhou Shi asked: "Since the report can be written, it means that the case must have been solved...how did the husband do it?"
Xu Yiqing pointed to the four words on the screen.
Fight poison with poison.
"The police found that some time before the trip, my husband purchased a lot of Aconite potted plants. In order to deceive others, he did not choose to buy ready-made aconitine poison, but extracted it from Aconite himself." Xu Yiqing said: "In addition, The police also investigated that he bought a thousand pufferfish.”
Check out the 16-9 book bar and see the correct version!
Because my husband is a businessman and puffer fish is an expensive ingredient, such a large order did not arouse the store's suspicion.
Lin Sheng suddenly realized: "The other abnormal value in the wine glass test report just now is tetrodotoxin!"
Tetrodotoxin, referred to as TTX.
It is an alkaloid neurotoxin that is widely present in nature and the most easily obtained. It is also one of the most deadly toxins considered by humans so far.
Xu Yiqing said: "Like aconitine, tetrodotoxin is also a type of neurotoxin. Its lethal effect on the human body is by blocking the flow of sodium ions, causing nervous system paralysis, and then causing heart disease. Because it acts on the nervous system , rather than poisoning that directly leads to organ failure, so it is very hidden.”
Du Yu thought for a while and said: "You mean, [the cleaner] gave Song Lang two kinds of poisons. These two kinds of poisons... well, how should I put it, the properties of the drugs conflicted, which greatly delayed the onset of the disease?" < br>
"It can be understood this way." Xu Yiqing said: "To put it simply, aconitine and tetrodotoxin affect the influx of sodium ions and the other affects the outflow of sodium ions. Only when the concentration of sodium ions is unbalanced will it cause nervous system disorders. . But the two poisons work at the same time, and the sodium ion concentration is in a dynamic balance, neither too much nor too little, so everything is normal."
"And because the decay period of tetrodotoxin in the human body is much shorter than that of aconitine, when the tetrodotoxin is exhausted and aconitine begins to take effect, two hours have passed since taking the poison, and the symptoms are aconitine. Death from head alkali poisoning and cardiac arrest.”
Whether it is aconitine or pufferfish poison, as long as a few milligrams are ingested, the poison will cause death, and it will be difficult for gods to save it.
But being exposed to these two poisons at the same time can allow the deceased to live without any worries for two hours.
Xu Yiqing's expression was serious, [Cleaner] was better at killing people than she thought!
And she must be an intellectual, with knowledge in various fields at her fingertips, including chemistry, pharmacology, counter-reconnaissance, and even disguise.
And he is very skilled, he may have served as a soldier abroad, he is ruthless and extremely dangerous!
Du Yu and Zhou Shi both showed expressions of sudden realization.
Only Lin Sheng was deep in thought.
"Brother Xu, the low content of aconitine in the laboratory report can be understood as being hydrolyzed after more than ten hours. However, tetrodotoxin is very stable and can only be degraded in a weakly alkaline environment. The reported content is lower than that of aconitine. It’s still low, can it really be used to offset the effects of medicine for two hours?”
Wine is slightly acidic, and the remaining wine in the glass will certainly not provide a space for tetrodotoxin to degrade.
Lin Sheng firmly believes in this.
It stands to reason that the content of various components of tetrodotoxin in the wine glass's laboratory report should not be so low.
Xu Yiqing laughed and teased him for not being serious: "If you don't read the report carefully, Asheng, you are still far behind."
He moved the mouse and clicked on the report just sent by the laboratory department. He pointed at the table and said: "The pH value of the liquid to be tested is 8.2. Such basic information should be remembered at a glance. This is the basic skill of forensic medicine... …The wine we drank last night was slightly alkaline.”
Most of the wines currently on the market are weakly acidic, but in recent years, weakly alkaline wines have also quietly appeared.
The human body's PH environment is alkaline, so alkaline wine is more suitable for the human body, reducing the burden on the liver and preventing calcium loss.
In order to highlight the taste of bitter almonds, Song Lang used alkaline wine as the base for his cocktail last night. At the same time, the pH value of ground dried almonds is between 7.5 and 8.0, which is also alkaline, resulting in residual wine in the wine glass. The liquid is an alkaline environment.
Part of the tetrodotoxin is degraded in alkalinity. If it is delayed for a longer time, the components may not even be detected.
Xu Yiqing sighed: "Pufferfish poison has no taste, while aconitine has a spicy smell. And this spicy smell is diluted by alcohol and almond aroma. Presumably when Song Lang drank it, he would only think of it as his own blend. The wine is just stronger than usual.”
If Song Lang had noticed something wrong with his taste and immediately sent him to the hospital for treatment, he might have been able to save his life because of the two-hour buffer period left by the two toxins.
It's a pity that this young man who was addicted to alcohol was eventually killed by his own wine glass and self-confidence.
Xu Yiqing closed the file and looked at everyone.
"Now that the time of Song Lang's poisoning has been determined, the only question left is why was there poison in my cup but I didn't die?"
Zhou Shi said: "About this, Boss Du and I have discussed this just now. We both agree that the poison is not in the wine or the cup."
Xu Yiqing wondered: "Where else can there be a place?"
Zhou Shi said: "In the ice."
Xu Yiqing was stunned when he heard this, and then suddenly realized: "I didn't die because I drank very quickly. I finished the sip of wine before the ice cubes melted?"
Zhou Shi nodded: "Song Lang drank for too long, the ice cubes melted, and the poison has entered the wine."
Du Yu quickly called the police: "Send all the ice cubes in the nightclub for inspection. Be careful not to touch the ice cubes. Be careful! They are poisonous!"
After hanging up the phone, he was afraid for a while: "Old Xu, this beast really wants to kill you, but if you are greedy for alcohol, then..."
Unexpectedly, Xu Yiqing rubbed the stubble on his chin and thought for a while.
"Lao Du, I have another opinion. Judging from my past interactions with her, [Cleaner] is a person who pays great attention to details. She must have understood us all. A person who knows me very well should I know very well that I generally don’t drink, and even if I do, I only try it lightly.”
This is no longer a secret. Not only Zhou Shi, Du Yu and Lin Sheng know it, but also some distant colleagues know that Xu Yiqing doesn't smoke and doesn't drink much.
On the day of the Winter Solstice Party, he only drank a little beer.
"Old Xu, what do you mean?"
"Is it possible that she knew I could finish the drink before the ice started to melt?"
"You mean she didn't want to kill you at all."
Xu Yiqing said: "Besides poisoning the ice cubes, I can't think of any way to poison Song Lang without poisoning me... After all, if you think about it, she really wants to kill me as well. Directly Wouldn’t it be more convenient to poison the wine?”
At least he doesn't believe that he can touch the ice cubes in the nightclub's back kitchen, but he doesn't touch the open wine.
Obviously, this is safer. If you drink it, you will die, and if you drink it, you will die.
The cocktail Song Lang drank was a cocktail he made himself. It couldn't be sealed like a retail cocktail, so he could easily poison the wine.
After talking about his conjecture, Xu Yiqing also felt very strange.
[Cleaner] Even though he called and threatened his life, why did he deliberately avoid himself when he was poisoned, as if he was afraid that he would be harmed when he killed Song Lang?
(End of chapter)