Serious Crime Unit 1

Chapter 639 Death of a Rich Man (11)
"There is such a thing, but the money was remitted from abroad. If the remitter cannot be found, it does not prove that it was Yang Rutie who remitted it to us. This is not the reason. The main reason is that the two of us jointly embezzled the company. 40 yuan, which is why Yang Rutie was kicked out of the company. If we sit upright and stand firm, we can ask the economic investigation team to intervene to see where the money was remitted from. But because we were wrong first, I don't even have the courage to ask the economic investigation team to open a case." He was a little ashamed.

"Excuse me, where were you from 8 to 26 a.m. on August 9?"

"Are you asking for my alibi?" He asked calmly, not angry.

"Yes, we must investigate anyone who has conflicts with the Yang family. This is also to clear your suspicion. Please cooperate."

"I must have been in the ward at the time. If you don't believe me, you can check the video. The security here is very tight, no less than in a military factory. You have to enter a password to enter and exit the only iron door. There are two security guards and monitors at the door to monitor them around the clock. Only the doctor Only the nurse knows the password to the door."

"Thank you for your cooperation. I'm sorry to bother you. Please go back." Jiang Yiming waved to him. He stood up, nodded to Jiang Yiming, and walked out of the office calmly.

They went to the monitoring room to review the video of that day. The video showed that Li Wei was in the ward at the time of the crime, so his suspicion was ruled out.And there is no possibility that he hired murderers because he did not have that kind of financial power.

A week has passed. Crime Team No. 1 has visited more than a dozen suspects, recorded a [-]-word transcript, and went to the provincial hospital three times to ask Yang Rutie and ask him to think again about other suspicious people he had not thought of. , he named a total of six suspects, but as a result of the investigation, they all had alibis, and the case was deadlocked.

Lu Yingying led the visual investigation team to review all the surveillance videos entering and exiting the scene, and checked hundreds of people, but no suspect was found.Wu Jiang and Xiao Ke tried to investigate from the shoe prints, but they were unable to find the owners of the six shoe prints. Even if they were found, it would be meaningless. The suspect could frankly admit that he had been near the scene and did not enter the central scene. There is nothing one can do.

"What should I do when the case reaches a dead end?" Jiang Yiming sat on a chair in the office, while Wu Jiang, Xiao Ke and Zhou Ting sat on the three-person sofa.

"Should we re-investigate the scene?" Zhou Ting asked.

"Yes, I think we have to survey the site again. We might have missed something when we surveyed the site."

"Is it possible that the wires are buried too deep and the trench we dug is too shallow?" Xiao Ke asked.

"Digging a trench of 50 centimeters is not too shallow. If the murderer had to dig a trench of 60 centimeters or even deeper to bury the wires, then he would have to spend a lot of energy and time, because he could only dig it in the dead of night and then bury the wires. Electric wires buried in the sand."

"Yes, the nearest power source is the street light on the grass in front of the first row of villas. The street light is nearly 100 meters away from the site. If a person wants to dig a trench 60 centimeters deep and 100 meters long to bury the wires, he doesn't have half a month to do so. It can't be done. If the murderer buried the wires so deeply, it would be difficult to take them back. Once the wires are discovered by us in time, the murderer will immediately reveal his flaws. Therefore, it is impossible for the murderer to take such a big risk to bury the wires." Xiao Ke said.

"It can be concluded that the depth of the murderer's buried wires will not exceed 10 centimeters, because after he completes the murder, he must take back the wires in time, otherwise, when we arrive at the scene, he will not have time to take them back."

"We'd better return to the scene. Sitting here and speculating is a bit unrealistic." After Jiang Yiming finished speaking, he picked up the landline and called Lu Yingying and Luo Jin, asking them to gather at the door and go to the scene to investigate again.

Everyone drove two survey trucks and carried survey boxes to the scene.The site was cordoned off with a warning tape. Due to strong winds, the iron poles supporting the warning tape were blown around. However, no one stepped into the site. Maybe tourists knew that a tragedy had occurred here and were taboo to enter.

The site has actually been surveyed very carefully, but Luo Jin feels that if the dry sand does not have a large amount of water to help conduct electricity, it will be difficult to electrocute Yang Min's family with a voltage of 220 volts. Luo Jin has already tested this in the laboratory , but the three deceased people were only wearing very few clothes at the time. After showering with tap water, they walked about 30 meters and returned to the recliner. There was very little moisture. The chance of success in electrocuting the three people was not high, especially With your feet in the air, you are less likely to be electrocuted.

Therefore, it is judged that the murderer may not have used household AC power, but directly connected the wires to wires without a transformer, so that they could be electrocuted instantly.

Under normal circumstances, if people are accidentally hit by 220 volts of electricity at home, people will reflexively disconnect from the wires and thus escape danger. Therefore, household power supplies are designed to be within 110 volts or 220 volts.

However, it is very dangerous for the murderer to connect wires from high-voltage wires to the scene, and people will see him when connecting the wires. Therefore, it is impossible for the murderer to connect wires from the poles to the scene. The only possibility is to connect the wires from home, and then Use a booster to increase the voltage to electrocute them.

Luo Jin lay prone on the ground and was checking the sand under the lounge chair. He observed it very carefully for a while and felt that the color of the sand was a little different, as if something was mixed in it?He asked Lu Yingying to bring three large evidence bags and put sand into the bags.

"Luo Jin, what are you doing? You pinch and smell the sand. Can it be used as food?" Lu Yingying smiled at him with her mouth raised.

"This is more delicious than rice." Luo Jin ignored Lu Yingying's humor and said seriously.Luo Jin is like this, too serious and lacks a sense of humor. He always keeps silent when dating a girl. He only responds when the girl takes the initiative to speak. Therefore, after dating a girl, the chance of him surrendering to her and becoming his girlfriend is very low. Small. "Oh, you must have discovered something? Otherwise, why not take the sand from elsewhere, but take the sand under the deck chairs, and take a portion of the sand under each deck chair."

"Yes, the color of this sand is a bit different from that found elsewhere. I suspect that the murderer may have mixed the sand with conductive compound powder, such as copper sulfate."

"Ah? Copper sulfate? What are its functions and properties?"

"Copper sulfate is a white or off-white powder. It is used to make other copper salts, such as cuprous chloride, copper chloride, copper pyrophosphate, etc. It is used in the coating industry to produce ship bottom antifouling paint; in the electroplating industry it is used for full-bright acid copper plating Main salt and copper ion additive; used in the printing and dyeing industry as a mordant and oxygen aid for fine dyeing; in the organic industry, used as a catalyst for the synthesis of spices and dye intermediates... In the agricultural field... Well, you'd better search on Baidu. In short , the murderer used copper sulfate to conduct electricity and electrocuted Yang Min’s family.”

"Disgusting! If you are so impatient with beautiful women, no wonder you can't find a girlfriend."

"You are someone else's wife, why should I be patient with you?" Luo Jin smiled lightly.

"But we are colleagues, no, comrades-in-arms! Comrades can live and die together, so don't be so utilitarian, okay?"

Luo Jin ignored her and continued to observe around the recliner.

"How can we prove that the sand is mixed with copper sulfate?" Lu Yingying refused to let him go.

"Well, go get a bucket of water and pour it on the sand. If it turns blue, it proves that there is copper sulfate in the sand."

Lu Yingying nodded, went to the survey vehicle to get a small bucket, walked 30 meters behind the recliner, turned on the one-meter-high faucet, took a bucket of water, and poured it on the sand of the recliner. Slowly, light blue appeared colored substance.

"Luo Jin, look, there is indeed copper sulfate in the sand."

"As expected, the murderer used copper sulfate to conduct electricity. He has a very high criminal IQ." After Luo Jin finished speaking, he looked up and saw Jiang Yiming and Zhou Ting looking for something on the grass in front of the villa; Wu Jiang and Xiao Ke were on the beach and in the villa. Exploration on the rock ridge.

When lunch was about to be eaten, everyone stood on the beach and gathered together to exchange the survey results. Luo Jin said: "Yingying and I found copper sulfate in the sand under the lounge chair. Copper sulfate is an extremely conductive compound. The murderer It was used to electrocute Yang Min’s family.”

"Ah? The murderer is so powerful? Can the murderer be found through the clue of copper sulfate?" Jiang Yiming asked.

"Almost impossible, because copper sulfate is easy to buy. It is sold in general chemical stores and online. The scope of the investigation is too wide." Luo Jin replied.

"Old Wu, have you and Xiao Ke made any new discoveries?"

"No, the border between the beach and the coast is the stone sill of the villa, which is about 2 meters high, 2.5 meters wide and 250 meters long. The gaps in the stone sill are all glued with cement and there are no signs of being disturbed, so, It is impossible for the wire to pass through the stone ridge. If the murderer pulled the wire from the villa to the scene, then the wire must have passed through the stone ridge exposed."

"The results of the survey by Zhou Ting and I are also the same. Look -" Jiang Yiming pointed to the villa 150 meters away and said, "In front of the villa is a grassland 250 meters long and 50 meters wide. There is no trace of the grass being dug. Therefore, the murderer should have blatantly pulled the wire across the grass and to the beach before burying it under the lounge chair at the scene."

"If this is the case, then there must be witnesses, because the day of the crime was a Saturday, and there were many people playing on the grass, and it is impossible for the wires to be invisible. We can only use grass-green wires, which are not easy to be found. As long as we go door to door If you go and visit, there should be clues.”

"No, I don't think the murderer could be so bold. Looking at him using copper sulfate to conduct electricity, we know that the murderer is a thoughtful person. He should not make such a mistake." Luo Jin said.

"Did our investigation go in the wrong direction?"

(End of this chapter)