Criminal Investigation Notes

Hearing what he said, all the people present showed puzzled looks on their faces. They didn't know where Su Hui deduced it from.

Even Jiang Xiang, the physical evidence at the side, came over curiously. Everyone surrounded Su Hui who was kneeling on the ground, waiting for his explanation.

Sooner or later, Lu Jun introduced Su Hui to Captain Qi and Jiang Xiang as the new consultant of the serious crime team.

On the way here, everyone greeted him politely, but he could still tell from the eyes of everyone that Captain Qi had some doubts about Su Hui.Probably because Teacher Su looks too young and weak, and doesn't seem to have any experience.

Now that Su Hui only stayed at the scene for a while, he suddenly said something like this, and was still questioning the testimony they provided before, Captain Qi was a little upset.

"If according to the testimonies of those witnesses, the suspect broke the lock and entered the door, took the murder weapon, went straight to Xie Peilan who was in the living room, and knocked down his wife quickly before she could yell. The murderer used a murder weapon similar to a baseball bat. I hit Xie Peilan on the head more than ten times in a row, resulting in her death. At this time, the mother-in-law heard the voice and went downstairs." Su Hui raised his head and looked at Captain Qi, "I'm repeating it right, right? ?”

Captain Qi nodded: "Yes, several people have said so, what's the problem?"

Su turned his head, pointed to the bloodstain on the wall and said, "But this bloodstain is completely different from the testimony."

Wujian Jiang Xiang was a little puzzled: "This is the blood splatter formed by the impact of gravity. When we arrived, it was already dry, so we carried out extraction tests." He compared the results of the tests, "The blood belongs to Xie Peilan, and no blood was found. Alcohol and drugs, and nothing else was found..."

Su Hui pointed to the bloodstain and explained: "The special thing is not in the blood, nor in the form of blood splatter. With every blow, Xie Peilan's blood will splatter on the wallpaper, forming blood stains. After the blow stops When the blood is dry, the blood will have time to seep into the wallpaper. When the blood is half dry, a new blood spray will come up again. At this time, the excess blood will flow down the wall, but some blood will continue to seep."

His fingertips slid across the red patch, pointed to the lighter part on it, and pointed to the obviously darker part on the side: "Because of so many splashes and infiltrations, we can see , These bloodstains finally showed different shades."

Hearing this, Lu Junchi understood, and he squatted down to observe carefully: "That is to say, the deeper places may have been sprayed with blood many times, and those shallow places may have been sprayed with blood once? "

Su nodded back: "The more blood penetrates, the color will be slightly darker." He pointed to the deepest part in the middle, "There may be three times of blood splashing here."

"Makes sense..."

As soon as Su Hui pointed out these abnormalities, Jiang Xiang immediately discovered that this was a tiny detail that he and the previous material book had overlooked, "These differences in depth are caused by blood penetration. If the blood has not had time to penetrate the wallpaper, spray it With new blood, the blood will fuse together, and will not form such a trace."

Su Hui continued to point to the wallpaper: "I took a look at the wallpaper, and it's not very permeable. Being able to form this kind of mark indicates that the time interval between the blows may be relatively long."

Jiang Xiang nodded again and again: "Consultant Su, your analysis is very reasonable. Later we will collect some wallpapers and conduct simulation experiments in the physical identification laboratory to see how long the time interval can form such traces."

Lu Junchi got up and concluded: "In any case, this shows that Xie Peilan did not die immediately, and there is indeed something wrong with the testimony."

Su Hui pointed to the side again: "There's still this here." Everyone followed his slender fingers to see that there were two marks, both at a lower position, one was vertical, a bloodstain with some rubbing marks, and There was one, a round pale bloodstain.

Su replied: "This piece of blood was probably caused by the deceased's head sliding against the wall, and the one next to it may have been caused by the deceased's hand holding onto the wall. The deceased must have struggled and called for help."

Listening to Su Hui's analysis, Captain Qi's face became hot, but he had to admit that these were the evidence they had missed before. These traces all showed that the death process of the deceased was long, which did not match the testimony.

The murderer slammed Xie Peilan on the head, and after a while, he slammed several more times. This process may have been repeated several times.

This poor woman, who used to lie on the floor, moaned, twitched, struggled until she died...

How could the family members be completely unaware of the long and brutal process of murder when they were all at home?

Jiang Xiang recorded these items, took a photo and said, "Thanks to Consultant Su, I will add to the report later..."

Upon hearing this, Captain Qi admitted his previous mistakes, gritted his teeth, and said, "It's Mr. Su who observes meticulously...there is indeed a lot of doubt in this case. It may be necessary to conduct a second questioning of the relevant personnel."

Su Hui lowered his head and said, "We still need to conduct experiments before we can conclude."

Hearing their praise for Su Hui, Lu Junchi was even happier than he was being praised. He stood up, thinking about how to continue the investigation next.

The case quickly found a breakthrough point, and the inconsistencies in the confessions showed that there was another hidden story in this case.

He looked through the previous visit records. If it was really as Su Hui inferred, it was impossible for the neighbors not to hear anything.

When Jiang Xiang and Captain Qi left, Lu Junchi was about to ask someone to go downstairs with him to chat with the neighbors when he heard Su Hui call him in a low voice.

Lu Junchi bent down and asked, "What's the matter? Is there any question?" Then he came to his senses, frowned and asked, "Why are you still kneeling?"

Su Hui sighed, did not speak but hooked his fingers at him.

Lu Junchi had no choice but to lean close to him.

Su Hui then leaned into his ear and whispered, "I'm numb on my knees and can't stand up, can you help me?"

Lu Junchi: "..."

Su Hui was in a kneeling position with the TV cabinet behind him, obviously unable to stand up, Lu Junchi bent over in front of him and hugged him from his armpit, and then helped him up.

Su Hui's whole body was extremely light, not at all like the weight he should have at his height.His legs were completely numb, and he couldn't exert any strength on his waist. He leaned on Lu Junchi's body, grabbed his clothes and hissed.

Lu Junchi asked, "Is it very numb?"

Su replied: "I just can't move yet, let me lean on for a while."

Lu Junchi hesitated for a moment, and stretched out his arms around his waist, which were too thin...

The two people were really close together. From behind, it was Lu Junchi who hugged Su Hui.

Just as Jiang Xiang's eyes turned to this side, he turned away as if being burned by fire: "That Captain Qi... I have something to ask..."

Lu Junchi didn't care at all, and then he saw the shoelaces on Su Hui's feet untied, and sighed: "You..."

In his opinion, Su Hui was really worrying enough. How could such a smart person not take care of himself?

When Su Hui stood still, Lu Junchi squatted down, flipped his fingers deftly, and tied a bow on Su Hui's shoes.

Su Hui narrowed his eyes, showing the crouching silkworms in front of him: "Thank you, Captain Lu."

Lu Junchi said: "Would you like to find a place to sit for a while? I'll go to the neighbor's house to see."

Su Hui rubbed his legs that had just recovered, walked a few steps and sat on the stairs of the duplex building.

He didn't dare to bend down because he was afraid of the recurrence of the previous back injury, and his back was straight. His sitting posture looked like a child sitting on the stairs waiting for his parents to come home.

Lu Junchi called a little policeman. He was about to go downstairs, but after thinking about it, he turned back and handed Su Hui's backpack and the documents of those cases to him.

Su replied with a thank you, and sat on the stairs of the duplex building, flipping through the photos of the corpses.

In the photo, Xie Peilan's eyes were half-opened, and the right side of the head to the ear was covered in blood and flesh. The blood and brain tissue had long been entangled with the hair, and the death was extremely miserable.

If this case was not committed by those foreign robbers, then who could be the real murderer?

Su Hui stared at those photos, from which he could feel the murderer's strong hatred for Xie Peilan...

The image of the murderer gradually became concrete in his mind, and the whole process of committing the crime became more and more clear.

But those are just theories, and he still needs actual evidence to confirm his profile.

Su Hui suddenly raised his head and asked Jiang Xiang: "Jiang Wujian, did you bring Luminol?"

"Bring it." Jiang Xiang has two bottles of luminol, which he always carries with him in the material appraisal box, "Where do you think there is still blood?"

Su replied, "I'm just guessing...can you spray the wall behind the sofa for me?"

Jiang Xiang put on a mask, took two steps forward, and looked suspiciously at the wallpaper behind the sofa. Although there were some dark marks there, it was not certain that they were blood.

He sprayed some luminol on it, and the reagent reacted for a while, then Jiang Xiang looked at the fluorescent color that appeared on it and let out a snort.

There was the familiar sour smell of luminol in the room. Su Hui coughed for a while, and managed to stabilize himself. He couldn't see clearly, so he could only ask, "Did you find anything?"

Jiang Xiang looked at the spots gradually appearing on the wall: "Yes."

The luminol reagent is a mixture of luminol and hydrogen peroxide. It has a very high sensitivity and can detect one percent of the blood. It is especially suitable for detecting traces or long-term blood stains that have been wiped.

Su Hui felt relieved, and said in a hoarse voice, "Okay, then you can spray other places."

Jiang Xiang asked, "Where?"

Su Hui: "Spray whatever you want, blank places, walls, and floors."

Jiang Xiang took the reagent bottle and started spraying, so more traces appeared on the wall and floor.

Su Hui said again: "You close the curtains and have a look."

Jiang Xiang sighed, and as the curtains were drawn, the environment dimmed, as if by magic, there were many fluorescent traces splashed on the off-white wallpaper and in the gaps on the ground, these traces were obviously rubbish. Tried bloodstains.

Even if Su Hui's eyesight was bad, he could still see that there were many traces of blood on the walls of the room, and the entire first floor was like a haunted house.