Captain Lu was aloof again today.

Chapter 112 Loophole
"What's the panic? We've got his whereabouts now. Print out his photo and go door-to-door asking him. Ask everyone in the food court. He's dressed so conspicuously, someone's bound to notice him."

Lu Jingming's gaze was cold, and his attitude towards this extremely arrogant outlaw was very stern.

The poisoner was very clever; he knew there were security cameras in the store, so he disguised himself by wearing a mask and sunglasses, making it impossible to obtain his facial features.

But he forgot one thing: in such situations, the more bizarre one's behavior and attire, the more attention one is likely to attract.

Lu Jingming's eyes darkened: "Also, let the forensic evidence compare Xu Caihong's pastry box with the packaging bag left by Meng Yanan. There may be fingerprints of the murderer on them."

Goods displayed on shelves are easily touched and leave many marks, but if the same fingerprints can be found on the snack box and bread bag, they must have been left by the murderer.

Chen Jin scratched his head and said, "Even if we find the fingerprints, it's useless if we can't find him. The murderer is certain that we can't do anything about him."

“Every corner he stood in, every object he touched, everything he left behind… even if he was unconscious, he would leave behind a silent witness against him.” Wei Qingsong suddenly read a passage softly.

Lu Jingming raised an eyebrow at her: "Loca's Law of Exchange."

"Yes." Wei Qingsong smiled slightly, their eyes met in understanding, and they smiled at each other.

Only Chen Jin was completely bewildered, like an outsider: "What green card?"

"It is a theory proposed by forensic scientist Roca. He said that whenever two objects come into contact, a transfer phenomenon will occur. At the crime scene, the suspect will inevitably take something away and leave something behind."

Wei Qingsong patiently repeated: "As long as the murderer has been at the scene, he will definitely leave all kinds of traces. These traces are silent witnesses and the key to prosecuting the murderer. There is no perfect crime in the world. The key is whether we can find the loopholes left by the criminal."

"Our murderer, however, has obvious flaws. Although he wrapped himself up like a mummy, he didn't wear gloves or shoe covers. Fingerprints and footprints could be clues to finding him."

Lu Jingming nodded slightly and added, "Besides, the murderer disappeared under the department store's surveillance cameras. Without a doubt, he must have changed his clothes. So what happened to the clothes he took off? He either took them with him or abandoned them. They can't just disappear into thin air."

"Therefore, we need to search the trash cans in the mall to see if we can find any clothes that the murderer discarded. In addition, we need to pay special attention to pedestrians carrying bags in the surveillance footage."

“Since Captain Lu brought this up, I’d like to offer another idea.” Wei Qingsong pointed to the poisoner in the surveillance footage. “The poisoner’s attire was different on two consecutive days. He might even have worn a wig. He was quite meticulous. I suspect he might have taken his clothes with him.”

“And if you look closely, when he first appeared on the street from the food court, he had nothing in his hands. That means he probably hid his clothes somewhere in the mall beforehand, which shows that he is very familiar with this area.”

“But when he leaves, he always takes his clothes with him. So, the person we’re looking for is only shown leaving the mall in the security footage at the entrance, not entering, and he must have been carrying something in his hand.”

“Also, clothes can be changed at will, but a person’s behavior is hard to change. We can observe his gait from the surveillance footage and try to find some of his habitual little movements. Finding him from the surveillance footage is difficult, but not entirely impossible.” Wei Qingsong zoomed in on the surveillance footage and projected it onto the screen, her clear eyes flashing with a cold light.

Some cases remain unsolved for a long time because many clues have not yet been discovered, or have been destroyed or ignored.

This poisoner was indeed clever and cunning enough to hide and disguise himself, committing poisoning in broad daylight. Even if surveillance cameras captured his image, they couldn't find out who he was.

This is tantamount to a silent provocation for the police.

But as long as they are patient and meticulous enough, and do not overlook any clues, they will eventually be able to find out his true colors.

“There’s another point that I’m very concerned about. On the first day, the poisoner chose to poison the handmade pastries from Xunji Pastry Shop, and on the second day, he chose to poison the bread produced by Xunji and sold in a convenience store. For two consecutive days, the targets of his poisoning were Xunji products. I suspect that the murderer did this intentionally,” Wei Qingsong said calmly.

Chen Jin was somewhat puzzled: "Could it be a coincidence?"

“I don’t think it’s a coincidence. Just now at the Tiantian convenience store, I noticed the bread shelf. Xunji’s bread was on the third row, which wasn’t in a prominent place. Given my height, I would have to bend down to reach it. If the murderer only wanted to poison the food, he could have chosen the most convenient row of bread. He would have had to bend down to inject potassium cyanide into Xunji’s bread, which would have increased the risk of exposure. There’s no reason for him to do that.”

Wei Qingsong explained the logic behind it.

Chen Jin understood, but didn't quite understand: "Why? Does the murderer have a grudge against Xun Ji?"

Wei Qingsong gently shook his head: "I cannot give a definitive answer at the moment, but the murderer is indeed targeting Xun Ji very much."

"Sister Wei, according to the logic of criminal psychology, what kind of person do you think the murderer would be?" Chen Jin suddenly recalled the excellent performance of criminal psychology in previous cases and asked curiously.

"The perpetrator is no more than 40 years old, has received higher education, and possesses some knowledge of chemistry."

Wei Qingsong closed his eyes slightly, thought for a few seconds, and said in a slightly low voice: "Potassium cyanide is not a poison that ordinary people can come into contact with. The murderer has some connection with the electroplating industry. He may have worked in the electroplating industry before, or he may have relatives or friends who are practitioners in the industry."

"Potassium cyanide is a highly hazardous chemical controlled by the state. Only qualified manufacturers can obtain approval from relevant departments to purchase it from designated chemical companies. From transportation and purchase to management, it must go through layers of permits, and ordinary people have no way of coming into contact with it."

"His choice of potassium cyanide, an unusual poison, and his thorough understanding of its lethal dose, along with his ability to control the dosage, demonstrate that he has a good educational background."

“For two consecutive days, he appeared on the street of the food court at 8 o'clock and disappeared from the mall at around 11 o'clock. This has a certain regularity. He is very familiar with the distribution of surveillance cameras in the food court, and even knows the location of cameras in each store. I think his workplace is in the food court, and his job should be very stable. He has been working in the food court for at least a year. Before this, he must have visited Tiantian Convenience Store and Xunji Dim Sum Shop many times.”

Thank you to Huakai Fugui and Molan for the monthly tickets.

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(End of this chapter)