Chapter 28 Chapter Twenty Seven

A kidnapping case that had little impact at first turned into a major murder case that shocked the city bureau within half a day. After Wang Gedong came out of the director's office, his face was very ugly. In general units, the top leaders don't understand the business, and are often sent by the superior to manage personnel affairs, and the deputy is the business elite, and their county is no exception. The chief didn't know criminal investigation, so he didn't reprimand Wang Gedong much, but the city bureau leader ordered him to explain why the hostage's mother was killed when the ransom was paid. Is your sharpshooter on the platform?

In kidnapping cases, hostages cannot be rescued from time to time, and it is understandable.But the hostage's mother went to pay the ransom, but was killed under the nose of the police. This is unique and unforgivable! Even worse, the murderer never showed up. He needs to carefully consider how to write this investigation report. If the reasons cannot convince the superiors, his career will basically come to an end. He is not a background bureaucrat. He is a complete technocrat. He has reached his current position entirely on his own business ability. If something goes wrong, no big boss will cover him. He can only take care of himself.

In comparison, Gao Dong, deputy director of the Municipal Public Security Bureau in the neighboring city, had a major serial killing of officials last year. The murderer killed all the targets before he was caught. However, Gao Dong was not only not held accountable, Instead, he was promoted to the position of deputy director of the Municipal Bureau this year. Who made his father-in-law the official secretary of their Municipal Law Committee? It's really an official comparison, an official with no background. In comparison, in the officialdom, Wang Gedong is considered a bit of a "stupid" person. It can also be said that he is much more upright than his colleagues. , he had abolished Jiang Ping long ago.

He is not very popular in the leadership group of the county. Fortunately, relying on his professional skills in criminal investigation, it doesn't matter whether others like him or not, and he still has to rely on him to take the lead in a big case. Now that this kidnapping case, which his colleagues would laugh at after hearing about it, he really doesn't have a big head. Readjust your mind, let's investigate the case in detail from the beginning, as long as the case is solved, everything will be easy to talk about. He took a deep breath, walked into the forensic laboratory, and called out Forensic Doctor Chen: "Old Chen, what's the result of the autopsy?"

"Jiang Xiaobing died a few days ago. His body was softened. The exact time of death needs further inspection. According to my experience, it should have been five days since he died." "Five days?" Wang Gedong was taken aback, "Jiang Xiaobing died the day he was kidnapped?" "should be." "Then the kidnapper asked Wang Liqin to listen to her son's voice yesterday, which is obviously a previous recording. No wonder I only listened to it once from beginning to end!" Old Chen helped his glasses frame, and said: "Boss, this case is not simple, the murderer is definitely a formidable person, look, this is something that was taken out of the bottom pocket of the suitcase this morning."

Lao Chen took out a clip made of three iron plates. There was a spring mechanism in the innermost part of the clip. There were more than ten small holes on the second iron plate. There are more than a dozen needles, these needles are cut short, and the cut surface is re-cut to be sharp, facing the hole on the second iron plate.The other end of the needle is a very short needle barrel, which is connected to the first iron plate. Old Chen said: "This is the mechanism made by the murderer. The mechanism is not complicated, but it is very ingenious. You see, if you press it directly on the iron plate, this mechanism will not lock. At that time, the murderer put the letter next to the spring, and Wang Liqin stretched out the letter. Put the letter in the bottom pocket, pull the spring when you take out the letter, and the mechanism will close. These needles will be inserted through the holes in the second iron plate, clamp Wang Liqin's hand, and pierce into her skin at the same time. It is connected with a small syringe that is cut very short, and the syringe is connected to the iron plate with a movable rubber stopper, so when the mechanism is closed, the upper iron plate exerts a downward force on the rubber stopper to make the liquid in the syringe flow from the needle. Injected into Wang Liqin's skin. The murderer was very thoughtful. He considered the limited strength of the iron plate clamped down and the high resistance of the rubber stopper, so he deliberately applied kerosene for lubrication around the rubber stopper. Apparently the murderer passed through it many times. Experiment, make sure the device works. Like this."

Forensic Chen fiddled with the mechanism in his hand, constantly opening and closing the iron plate. Wang Gedong frowned deeply, and said, "What's in the syringe?" Old Chen's eyes turned cold, and he said, "Nicotine, high-purity nicotine." "Nicotine? But this syringe can only contain so much, and the force of the iron clamp is not particularly strong. The amount of nicotine injected into Wang Liqin's skin is also very small, right?" "Well, it's very little, but just a few drops is enough to kill a cow, let alone Wang Liqin. Nicotine is an alkaloid that penetrates very quickly in the human body. It only takes ten seconds to act on the body. Nerve tissue. I believe that Wang Liqin only noticed that her hand was pierced, and didn’t realize what happened at all. By the time she felt that she was going to pass out, it was too late. Wang Liqin’s hand was pierced to her real death. It should not exceed three minutes This is still slow, because she was stabbed in the hands, if the neck was pierced closer to the brain, she would have died in less than a minute."

Wang Gedong touched his forehead: "I've only seen nicotine as a poison in public security publications before, but I didn't expect it to be so powerful." "Yes, nicotine was first extracted from tobacco. In fact, the nicotine in a pack of cigarettes is enough to cause death. People who smoke rarely suffer from nicotine poisoning. On the one hand, after the tobacco is ignited, part of the nicotine reacts with formaldehyde to neutralize the On the other hand, most of the nicotine volatilizes into the air. And people don’t smoke non-stop, the amount inhaled into the body is very small and will be quickly decomposed. If a person smokes non-stop, I believe that after smoking a few packs, He would also die on the spot. If more than 30 mg of nicotine enters the body at one time, it is fatal, and the death is very fast, and there is no way to save him. The nicotine injected into Wang Liqin's skin obviously exceeded 30 mg."

At this time, a staff member ran over and said, "Boss, nicotine was also detected in Jiang Xiaobing's body." Wang Gedong glanced at Forensic Doctor Chen and asked, "Is there no other trauma on his body?" "No, the cause of death must also be nicotine poisoning." Wang Gedong pursed his lips, and said: "Combining with what you said that Jiang Xiaobing died for more than five days, it seems that Jiang Xiaobing was not kidnapped at all, but Jiang Xiaobing was killed directly." Old Chen nodded: "It seems that Jiang Xiaobing's voice for a few seconds was recorded by the murderer after he was poisoned."

"How about the investigation of the three million?" Old Chen said: "I found out, I asked my colleagues, and all the tin foil sold in the supermarket is actually not tin foil. Because the tin foil is easy to remain on the barbecue after grilling, causing harm to the human body, so now all the tin foil is not tin foil. Tin foil is actually aluminum foil." "Aluminum paper? Then the aluminum paper disappears, what does it matter if the money is corroded?" "We took apart the lid of the box and checked it. The murderer made an interlayer inside the lid. The interlayer was covered with small grids. Each small grid was filled with metallic sodium. Metallic sodium is an extremely active substance. It will react quickly in the air, and even spontaneously ignite, so the murderer covered the metal sodium with a layer of dense high-purity limestone, that is, calcium carbonate, to block the contact between air and metal sodium. After the box is placed at the bottom of the lake, the water enters the box, the limestone absorbs water, and the water then contacts with the metal sodium to generate sodium hydroxide and hydrogen gas. Then the hydrogen gas opens the densely packed limestone, making the water and The metal sodium is fully contacted, reacts more quickly, produces a large amount of strongly alkaline sodium hydroxide in a very short time, and releases a large amount of heat at the same time. Aluminum is located on the diagonal line of the periodic table, and it is a very special metal. General metals can only react with acid and will not react with alkaline solution. Only two or three metals such as aluminum can react with both acid and alkali. Aluminum paper will quickly react with high concentration of sodium hydroxide , the reaction dissolved, exposing the money wrapped inside. Of course, the money couldn’t stand the corrosion of high-concentration sodium hydroxide, and it immediately rotted into a pile. Some of the money showed carbonized burnt marks, because this reaction released a lot of heat energy, and the water temperature rose rapidly high result."

Although Wang Gedong said that his early chemistry knowledge had been handed back to his teacher long ago, he could still understand what Chen Forensic Medicine said. He summed it up and said: "You mean that there are two chemical reactions taking place in it. First, metal sodium and water The reaction produces highly alkaline sodium hydroxide and hydrogen gas, then the sodium hydroxide dissolves the aluminum paper, and then the money gets corroded. Right?" "Well, that's right." Wang Gedong scratched his head: "It doesn't sound complicated." Forensic doctor Chen said: "These two reactions are not complicated, but the murderer would come up with such a way and use these two chain chemical reactions to achieve his goal. I think it's amazing. Especially covered with limestone to ensure that the metal sodium will not be in advance. Deterioration. Then the hydrogen gas produced by the contact of metal sodium with water breaks through the limestone covering layer, allowing the reaction to proceed more quickly and fully. And the murderer made small grids on the interlayer, which has two functions. The reaction in the air is extremely fast. The murderer can only save it by placing a grid and immediately covering it with a layer of calcium carbonate. Second, the metal sodium reacts very violently in the water. If so much metal sodium is thrown into the water together, it may cause an explosion effect, and the box will explode. Vigorous shaking. But first installing a small grid and then covering it with calcium carbonate can reduce the surface area of ​​metal sodium in contact with water, so that the reaction can proceed slowly. In short, this idea is very innovative, and I have never seen it before.” Wang Gedong felt a little at a loss. People who do criminal investigation work are not too young. How can they remember the chemistry they learned decades ago? After thinking for a while, he said: "The high-purity nicotine you mentioned just now, how can you buy it?" arrive?" "I shouldn't be able to buy it. I have to ask my peers about the purchasing channels in this regard." "Okay, let's do this first, and let me know the result as soon as possible." Wang Gedong left a little frustrated. He felt that the whole idea of ​​the kidnapping case had not been fully clarified, and he needed to think it over from the beginning.And the murderer used nicotine and a chemical reaction. He had never seen a gangster of this level.