novice forensic medicine

Chapter 289 Residues in the Nails

Zhou Ning turned his head sharply and saw Da Zhao running over quickly holding an evidence bag.

Running to the front, Zhou Ning stared at the evidence bag, and found something dark inside, which seemed to be blood, but this thing had several protruding parts, and there were holes on it. After careful observation, Zhou Ning suddenly lifted the bag. beginning.

"Latex gloves? Where did you find them?"

Da Zhao pointed to a huge bucket on the west wall of the courtyard and said:

"I followed the footprints and surveyed towards the south, and found two dilapidated waste oil barrels with a lot of firewood and branches in them. I took out the firewood and branches, and saw the broken one below. Latex gloves, there is a cut at the base of the little finger of the glove, and there is a ball of paper, probably blood was wiped, so I also put it on."

Zhou Ning shook the latex glove, and the glove was unfolded inside. Sure enough, the root of the little finger was cut, but it was all soaked in black blood.

"Great, let's see if the person who submitted the inspection has left. Come back and take this, and send it directly for inspection. Even if there is no blood on the cut, there will be sweat stains and skin flakes on the inside of the latex gloves. If you are lucky, you can find the murderer Let Sister Cui carefully sample and compare the DNA."

Big Zhao laughed.

"I called early, and Xiaobai has already gone back. I will call Sister Cui in a while, but I remember that the dagger stuck in the back of the deceased had a glove. How could it cut the glove?"

Zhou Ning found the picture of the murder weapon and looked at it carefully.

"There are indeed gauntlets, but the width is less than one centimeter. If the thrust is too strong and the hand cannot be prevented from sliding down, or the gauntlet is not smooth, it may cut the glove. If blood can be detected, the evidence will be perfect. "

Xu Dayuan waved his hand.

"Stop talking nonsense, go back and eat first, and then do a second autopsy."

An hour later, everyone returned to Hai'an Criminal Police Squad.

After a simple meal, Zhou Ning took people to the forensic anatomy room. The hardware conditions in Hai'an City are not comparable to Qidong and Rudong City. Although it is also a work area set up in the criminal police team, the space is very tight, and there is no recording equipment. .

In the morning, Liu Yongxin had someone install the scanning equipment and connect the system software. Zhou Ning's usual LED light was also installed and placed on the side.

Bai Hua asked a lot of questions, and was very curious about this new equipment. Zhou Ning did not hide his secrets, and explained the application method of the software in anatomy. After all, the Municipal Bureau organized this backlog case cleaning work, and another focus is to promote the software. To improve the detection capability of each sub-bureau and county and city bureaus.

The child's body was sent first, and the body was in good condition without extensive corruption caused by repeated freezing. Zhou Ning surrounded the body and carefully observed it from head to toe.

Zhu Xingxing cooperated with Xia Momo to scan the body with X-rays. From the operation of the machine to the use of pictures, Xia Momo explained to Bai Hua in a low voice.

On the other side, Zhou Ning compared the autopsy report and found that Bai Hua's autopsy was very meticulous, and the boy's perianal examination was not missed. As for the mouth, nose and neck, DNA was also collected, but there were no special findings. However, in the dead man's bronchi, several fibers were found.

"Bai Forensic Doctor, do you think that the deceased Wang Jiahan's breathing was blocked by a soft knitted fabric such as a pillow, causing mechanical suffocation, and then he was thrown into the water in the pickle jar?"

Birch nodded.

"During the investigation of the scene, we found a plush pillow with a diameter of [-] centimeters, and the filling fibers were extracted from it, which was consistent with the fibers found in the bronchi of the deceased. We also found a piece of light yellow liquid residue on the plush pillow. According to the DNA comparison, it belongs to the deceased Wang Jiahan."

Zhou Ning hummed, Bai Hua's examination was still very careful, finding fibers in the bronchi, which is rare for ordinary people to be so meticulous.

Seeing the inspection of the nail extract attached to the back, Zhou Ning took a look, and sure enough, the nails of the deceased had been cut close to the edge, but there was no effective discovery on this.

Zhu Xingxing and the others were all around. It was strange to see that Zhou Ning hadn't done the autopsy for so long, but no one interrupted Zhou Ning's observation.

When he saw Wang Jiahan's toes, Zhou Ning waved his hand towards Zhu Xingxing who was behind him. Zhu Xingxing quickly moved the LED light over and grabbed the swing arm. Zhou Ning approached the dead man's toenails. There appears to be residue.

Da Zhao's eyes are good, and he also saw the residue, so he hurriedly held up the camera and moved closer. Bai Hua quickly surrounded him, and Zhou Ning gently scraped it with curved tweezers, and extracted a little dark brown substance, which seemed to be still there. There is a very small hair.

Zhu Xingxing handed over the collection box, Zhou Ning directly threw the tweezers to her, then picked up another tweezers to check the other toes, but this time nothing was found, Zhou Ning cut off the edges of all the toenails and kept the samples.

Bai Hua was a little embarrassed, looking at the extracts he found, he couldn't tell them apart for a while.

"Is this blood?"

Zhou Ning shook his head.

"It looks like skin residue. The time of the incident was summer, and the human body metabolizes quickly. Many people take showers every day, but thorough cleaning of the skin is not done every time. Let's keep a sample for inspection. We will know exactly what it is after the inspection. "

After finishing speaking, he returned to the side of the dissecting bed and signaled Da Zhao to start recording an overview of the video. Zhou Ning carefully checked all the organs that had been dissected and their various states.

Bai Hua watched his movements, listened to his analysis and judgment, completely lost the contempt she had at the case analysis meeting.

After finishing all this, Zhou Ning let go, and Zhu Xingxing quickly took over to clean up and stitch. After everything was done, Da Zhao turned off the recording system.

Zhou Ning then said:

"The deceased was only two years old, and his reaction was different from that of adults. When he was awakened or felt unwell, his subconscious reaction was to use his hands and feet together, and it was August. Even if he slept with a thin quilt, he was likely to push the quilt, so this Mark a few samples, and explain the extraction requirements to Sister Cui."

Just as he was talking, He Dongmei's body was brought in. Zhou Ning walked over and found that He Dongmei had a very small wound in the middle of the third and fourth ribs from the front. It seemed that the dagger had penetrated very deeply. Pierce the body.

"Is the murder weapon here, or is it kept in the evidence room?"

"There is a second autopsy here. I have already sent the physical evidence over here."

With that said, Bai Hua walked to one side and brought over an evidence bag, without opening it, he could see the shape of the dagger inside.

Taking advantage of the gap, Zhou Ning took a look at Bai Hua's autopsy report. Sure enough, like the other deceased, the anatomy of this one was also very careful, and there was a trace of blood congestion on the back, which made Zhou Ning take a second look.

Da Zhao took it over, measured it carefully and quickly gave the data.

"The total length of the dagger is 26.6 cm, the length from the glove to the bottom of the handle is 9.2 cm, the blade is 17.4 cm long, and the widest part of the blade is 4.26 cm. It is single-edged. There is a sawtooth-like setting 4.2 cm below the blade, and there is a blood groove on the side of the dagger."

Zhou Ning measured the distance from the back to the chest of the deceased, which was 17.7 centimeters. If the deceased was lying on his stomach, the chest would be squeezed, and he could indeed be pierced from the front.

Under Zhou Ning's gesture, several people stepped forward and turned the deceased's body over. At this time, the wound was exposed, and the back looked even more tragic.

"Let's scan it first, and then we will analyze it. Just scan it in this state to see if there is any damage on the thoracic side of the third and fourth ribs."

Zhu Xingxing and the others moved, and a three-dimensional image appeared for a moment. Xia Momo zoomed in on the image, and sure enough, at the junction of the third and fourth ribs, there were only very slight cracks.

Looking at the picture, Zhou Ning closed his eyes slightly. It can be clearly seen from the picture that the dagger was pierced vertically. According to the position where the glove was cut, the murderer was chasing the dead behind. , or after being knocked down by the murderer, it directly pierced the back of the deceased.

However, this stabbing position is too accurate. Even professionals cannot guarantee that they can directly find the middle of the third and fourth ribs in a state of exercise, and this knife directly pierces the heart.

"The three or four intercostal wounds on the deceased's chest were 1.1 centimeters long, and they were at a [-]-degree angle to the stabbing position on the back. The dagger pierced into the middle of the three or four ribs horizontally."

Da Zhao shook his fat face, and said in surprise from under the camera:

"Is that accurate?"

Zhou Ning did not answer, and took Zhu Xingxing and the others to carefully observe the body surface of the deceased. Of course, they turned the deceased over and found that the deceased's knees, elbows, wrists, and jaw were all scratched.

In the area of ​​the right kidney on the back of the deceased, there was a red bloody mark, a bit like a footprint, but it was very faint.

"It seems that the deceased was kicked from behind by the murderer, and then he jumped up and stabbed him in the heart and died. With such an injury, the deceased lost strength instantly and was unable to call for help."

Zhou Ning glanced at Liu Yongxin, who was measuring.

"The length of the shoe print is 29.5 centimeters. Big Zhao, take a photo and ask Xiao Qu to process it. Why do I think it seems that there are traces of patterns."

Bai Hua walked closer and carefully looked at the imprint on the back of the deceased.

"During the autopsy before, this mark was not so clear. It was just a faint dark red with unclear boundaries. I didn't find that it was a mark of a kick."

Zhou Ning smiled. In fact, he wanted to say this just now.

"Forensic doctor Bai, don't be depressed. In many cases, the bruises cannot be seen during the first autopsy. After the body is frozen and the second thawing, these marks will become clearer. My master and the others did not have such conditions before. Autopsy in the mortuary, this is a summary of their experience."

Liu Yongxin nodded.

"The conditions were difficult before, and I encountered everything."

The persuasion of the two made Bai Hua heave a sigh of relief, and Zhou Ning continued:

"It seems that the murderer's shoe size is between 43-44. Is Xiao Qu here?"

Momo Xia raised her hand.

"You don't need to look for him, I'll do the same, Da Zhao send it to me, I'll adjust the contrasting color of the picture for you now."

Da Zhao ran over and transmitted the picture to Xia Momo. Xia Momo operated on the computer for a while, as if by magic, the trace was adjusted to a contrasting brown in a moment, so that the pattern was more obvious.

Da Zhao also found the photos of shoe prints collected on the soil. Xia Momo did the same and put the two pictures together for comparison. Zhou Ning nodded vigorously when he saw the patterns on them.

"It's the same person."

　Exemption is limited, it will be released a little later tomorrow, try to add more!

　　
　
(End of this chapter)