Serious Crime Unit 1

Chapter 874
Luo Jin found a syringe, two empty insulin bottles, and two cotton swabs in the trash can. He sorted these items into evidence bags.He felt a little strange: Why did Jiang Hong inject two bottles of insulin at one time?Under normal circumstances, diabetic patients only need to inject 3 ml of insulin.

Jiang Yiming found five unopened boxes of insulin in the small refrigerator. The three boxes of insulin were neatly stacked together. There was a special plastic bag for the People's Hospital underneath. There was an invoice in the bag. Obviously, these insulins were issued from the People's Hospital. from.

The invoice contains the names of the prescribing doctor and the cashier. The patient is Jiang Hong, the prescribing doctor is named Fang Su, and the cashier is named Chen Lihong. The insulin was issued at 2019:4 pm on April 25, 3, and at 20 There are 5 bottles of insulin in total at the window.

Luo Jin was not expert in fingerprint identification. He felt that Jiang Hong's fingerprints should be left on the empty bottle and syringe of insulin, so he walked out of the bedroom, took out the empty bottle and syringe, handed them to Wu Jiang and said, "Brother Angkor" , these are the empty bottles and syringes containing insulin, see if you can find fingerprints."

"Okay, Luo Jin, do you think there's something wrong with these two empty bottles?" Wu Jiang asked.

When Luo Jinjing mentioned this to Wu Jiang, he suddenly had an idea. He took back the empty bottle handed to Wu Jiang, put it under his nose, and took a deep breath. He suddenly smelled a sweet smell, not insulin. The taste is very strange: is the bottle filled with sugar water or glucose water?

If Jiang Hong injected both bottles of sugar water into his body, his blood sugar would instantly soar to dozens of times that of a normal person. Without first aid, death would surely be waiting for him.

Luo Jin's sense of smell is very sensitive and can distinguish 5000 smells. Therefore, he felt that his judgment was correct. He walked into the bedroom and said to Jiang Yiming: "Captain Jiang, I think it is very likely that this is a murder case."

"Oh, tell me, what did you find?"

"I just sniffed the empty bottle of insulin with my nose, but I smelled the smell of sugar water. Jiang Hong probably injected the sugar water as insulin without knowing it."

"Do both bottles taste like sugar water?" Jiang Yiming asked with a frown. He really didn't want this to be a murder case.

"Yes, both bottles were filled with sugar water. I think it is like this: After Jiang Hong injected the first bottle of sugar water into his body, his blood sugar began to rise. He may have felt that the amount of insulin was not enough, so he took out another bottle and continued After the injection, his blood sugar spiked instantly, and he passed out on the sofa. Because both doors were closed, doctors could not go in in time to rescue him, which resulted in his death from ketoacidosis."

"Does that mean someone swapped his insulin for sugar water?"

"It should be like this."

"The bottle might have the murderer's fingerprints on it?"

"This is a smart murderer who should not leave fingerprints or shoe prints."

"Oh, this time we encountered an opponent with strong anti-detection capabilities." Jiang Yiming walked out of the bedroom, came to Wu Jiang and asked, "Old Wu, are there two types of fingerprints found on the empty bottle?"

"No, the fingerprints on the two empty bottles belong to the same person. I think they belong to Jiang Hong."

"Are there any suspicious shoe prints?"

"According to the doctor who came to the emergency room, only security guards, doctors and nurses have been to the scene. We have only extracted 7 different shoe prints. I think they belong to them and Jiang Hong, so no suspicious shoe prints have been found yet. , if the murderer entered the scene wearing shoe covers and gloves, we would not be able to find the suspect's shoe prints."

"The suspect should have entered Jiang Hong's house a day or two ago. According to our understanding, Jiang Hong is a very clean person. Even if the suspect came in wearing shoes, he might have been damaged by Jiang Hong with a mop. Because he mops the floor every day. .”

"We can review the surveillance video of the gate, because the gate is the only entrance and exit, so I think we should be able to find the suspect from it."

"I'm not so confident. The suspect is a master and will not easily leave clues to us... According to the emergency doctor, when they rushed to the door, the door of Jiang Hong's house was locked. If the suspect wanted to come in and commit a crime, he would have to use Key, so the keyhole can be inspected to see if any metal particles will be left behind," Jiang Yiming said.

"We have done a preliminary inspection and found nothing so far. We are going to take the two door locks back and check them again with a microscope to see if we can detect new metal particles."

"Who do you think is the most suspicious?" Jiang Yiming asked, looking at Wu Jiang and Xiao Ke.

"Of course they are Jiang Hong's relatives and friends. Only they have the opportunity to copy the key to Jiang Hong's house, and only they know that Jiang Hong suffers from severe diabetes." Xiao Ke answered.

"I think Jiang Hong's wife Gu Yiying is the most suspect. Of course, this requires in-depth investigation to make an accurate judgment."

At this time Wen Xiaorou came to the scene, and she was responsible for checking the cameras outside the scene.

"Xiaorou, how is the surveillance video in the community?" "Captain Jiang, it's not very good. In the past week, the surveillance system in the community has been fully upgraded and all monitors have been turned off."

"How can it be possible to turn off the monitor when the monitoring system is upgraded? Logically speaking, the new monitoring system should be compatible with the old system." Jiang Yiming didn't quite understand.

"I was also puzzled. I asked the security guards in the monitoring room. They were all newly recruited security guards. They didn't know. However, the monitors at the two gates of the community were not turned off." She seemed to feel guilty for not doing her job well.

"Okay, it's okay. There were no surveillance videos more than 20 years ago. Didn't our police still solve the case?" Jiang Yiming comforted her.

After the investigation was completed, everyone returned to the team.Luo Jin first took two empty bottles to the laboratory, then dropped a few drops of water into the bottles, shook them a few times, and then used a sugar detector to test the water in the bottles. The results proved that the sugar content in the two empty bottles was It is 6%, which means that the bottle is filled with sugar water, not insulin.

This result was expected by Luo Jin, but in order to be more rigorous, he used a sugar tester to test it.He entered the results into the computer, printed them out, and handed them to Jiang Yiming.

Jiang Yiming praised his quick movements.

Wu Jiang disassembled the two door locks of Jiang Hong's house, took out the lock core, illuminated the keyhole with a multi-band light source, and then examined it with a microscope, and found that there were tiny metal particles inside.He took out a special small cotton swab, inserted it into the lock cylinder, rubbed it a few times, and stuck the metal particles to the cotton swab.

Then a spectrometer was used to detect the metal on the cotton swab, and the result was an aluminum-iron alloy.This shows that the door of Jiang Hong's house was opened with a new key, and this person should be the murderer.If the door is opened with an old key, generally no aluminum-iron alloy particles will be left behind. Because the old key has been used thousands or even thousands of times, the aluminum-iron alloy attached to its surface has long been worn away, and it is difficult for particles to remain. In the keyhole.

But to identify the suspect who copied the key, these aluminum-iron alloy particles are not enough, because most of the materials for making keys on the market are aluminum-iron alloy. However, the biggest suspect was Gu Yiying, and now her suspicion has been reduced.

Wu Jiang handed the report to Jiang Yiming, and Jiang Yiming asked: "Old Wu, Luo Jin's report has also come out. The two empty bottles extracted at the scene were filled with sugar water. It can be confirmed that Jiang Hong was murdered. Do you think Gu Yiying has any No suspicion?"

"Of course there is. Although aluminum-iron alloy particles were extracted from the keyhole of Jiang Hong's house, Gu Yiying may use the new key to interfere with our view. Even if she did not do it, we can learn who the suspect is from her mouth. We must investigate She makes inquiries.”

"My thoughts are the same as yours. She might also give the key to the suspect to copy, and then hire the murderer to replace Jiang Hong's insulin with sugar water."

"The seal of the insulin injection is sealed. Only after removing the plastic cap can the insulin be withdrawn from the syringe. So, how did the suspect inject sugar water into the bottle without being discovered by Jiang Hong?"

"This is very simple. After opening the lid, take out the insulin with a syringe, then inject the sugar water into it, and use glue to glue the lid to the seat. This way Jiang Hong cannot find out that the bottle has been tampered with."

Wu Jiang nodded, feeling that what Jiang Yiming said made sense.

3
"Gu Yiying, after our investigation of the scene, we concluded that Jiang Hong was murdered. What do you think?" Jiang Yiming sat opposite her and looked at her.

"Murder? It's unbelievable. How could my husband be murdered? I don't believe it! Do you have any evidence?" Her eyes were unfathomable, filled with mist, like an abyss with no bottom.

"It's very simple. The insulin that Jiang Hong needs to inject every day was replaced by sugar water by the murderer. Jiang Hong, without knowing it, used the sugar water as insulin and injected it into his body, causing his blood sugar to spike instantly and causing death from ketoacidosis. .”

"What? Is there such a cunning murderer in the world? How did he get into my house?" She brushed her hair with her hands, looked at Jiang Yiming in surprise, and then moved her eyes to Zhou Ting's face.

"The murderer used duplicate keys to open both doors of your house and then entered the scene."

"How did you know? Did you see the murderer in the surveillance video?"

"No, I don't have surveillance video to watch, because the surveillance system of Green Island Community is being upgraded and all the monitors have stopped working. The murderer should know this, so he chose this time to attack. As for how we know that the murderer used a new key Open your door, we can’t tell you.”

"How did the murderer get the key to his original wife?"

"That's what we need to investigate, we want to know your activities over the past week."

(End of this chapter)