novice forensic medicine

Chapter 584 Leader, can I talk to you alone?
Miss Cui gave a meal.

"Don't rush, the inspection report and the comparison report are all out here, and they will be sent to you after printing, and then the electronic version will be sent."

"Okay, thank you ma'am."

After hanging up the phone, Da Zhao came over. He felt that Zhou Ning seemed to have something to say, and swallowed it back.

"What's the matter, Zhou Xiaozhou, do you want to do some experiments, but feel too embarrassed to ask, I'll do whatever you want."

Zhou Ning nodded.

"Call a few people, go to the freezer, find Liu Meiling's body, spray luminol reagent on the bruise on the neck of the deceased, and videotape the whole process."

Da Zhao didn't talk nonsense, he dragged Fang Mu, and the two went together.

After the person left, Xu Dayuan blinked and looked at Liu Yongxin. Liu Yongxin was obviously taken aback, and then he sighed and said:
"Xiao Ning suspects that the DNA left on the bruise on the neck of the deceased was smeared with blood by the murderer. As for the blood dripping from the wound of the deceased, it was also intentionally left by the murderer. Of course, in this way, it is even more impossible to determine who the murderer is .”

Hu Guangjian also stood up. After all, he was the leader on the front line, so he was quite indifferent, and told Xu Dayuan to go out.

Liu Yufei leaned over and asked in surprise:

"The DNA was left on purpose. In this way, wouldn't our investigation be useless?"

Zhou Ning shook his head. There is very little evidence. Xu Qingquan tends to identify the murderer as Zhong Xiaoyan, but all the characteristics he mentioned have been unraveled one by one. Zhang Fangfang has scar perfume, and the suspect becomes two people directly. Zhang Fangfang matched, and that Zhang Fangfang became the biggest suspect in this case.

At this time, Zhou Ning's cell phone rang, and he received a video from Da Zhao. With the spraying of luminol, a fluorescent reaction of the same shape appeared on the bruise on the neck of the deceased. Although it was very faint, it was blood.

Zhou Ning dialed Da Zhao's cell phone.

"Tell Lao Yang and the others to come down and search Zhang Fangfang's car carefully to see if there are any shoes and clothes, whether there is anything in the hidden gap in the trunk, or in the gap of the spare tire, and tell me if you find it."

Zhou Ning didn't say anything more. Liu Yongxin understood the meaning of this order. Peng Da and Liu Yufei looked at each other and understood what it meant. Since someone planted it, there should be something more solid, but he didn't find it.

After waiting for more than ten minutes, neither Xu Dayuan nor Hu Guangjian came back. Sun Gaotie came first, holding a thick stack of reports with many sticky notes on it. Zhou Ning took it and took a look.

It was simple, they had already been classified, Sun Gaotie kept his mouth shut, and did not take the initiative to introduce, after all, Zhou Ning hated people talking about it when he was reading the report.

After watching, after distributing the report to Liu Yongxin and the others, Zhou Ning didn't have a trace of joy on his face when he saw the end. At this moment, Xu Dayuan came back. Seeing such a thick stack of reports, he looked directly at Zhou Ning.

"What did the report say?"

"1. The DNA of a man and a woman extracted from the bones, compared with Zhong Xiaoyan's biological father-daughter and mother-daughter relationship, has nothing to do with the DNA extracted from Liu Meiling's facial wound;

1. After comparison, the DNA extracted from Liu Meiling's facial wound and the DNA extracted from the pinch mark on her neck are consistent with Zhang Fangfang's;
2. The vitamin A, related impurities and metabolites extracted from Li Li's inner blood are similar to the vitamin A, related impurities and metabolites extracted from Xu Qingquan's blood sample, and the impurities in Xu Qingquan's inner body are larger than those in Li Li's body ;"

"Wait, what does this mean?"

Xu Dayuan stopped Zhou Ning, and Zhou Ning quickly explained:
"That is to say, most of the vitamin A that the two of them took is the same, but the types of vitamin A in Xu Qingquan's body may be more complicated, which is also in line with our initial judgment, the amount of medicine and the amount of poisoning. It was tested on Xu Qingquan."

Xu Dayuan waved his hand towards Liu Yufei and said:
"Call the people left behind in the hospital and ask them to ask Xu Qingquan, did he often eat the food cooked by Zhong Xiaoyan when he got along with Zhong Xiaoyan before? Also, does Zhong Xiaoyan know how to bake? Zhou Ning, you continue to talk."

Liu Yufei went to the other side to make a phone call, and Zhou Ning quickly flipped to the next report and continued.

"4. Regarding the brake marks, compared with the gas chromatography of rubber cracking, it is concluded that the light brake marks at a distance of 50 meters to the east of the accident scene are completely consistent with the brake marks of Zhang Fangfang's BMW wheel;
5. Zhang Fangfang's DNA was found in samples 133 and 178 brought back from Kaifeng City. Sample 133 was marked as a sample from the doorknob of Page's hut, and sample 178 was a hair extracted from Liu Meiling's room. "

Having said that, Zhou Ning stopped, and Xu Dayuan's eyes widened.

He raised his hand and gestured for a long time, but didn't say anything, when Liu Yufei came back.

Looking at the crowd, Liu Yufei knew that during the time she was out, there were even more explosive test results, so she said without delay:

"Xu Qingquan said that Zhong Xiaoyan never enters the kitchen. She often orders takeaway and puts it on the dinner plate, saying that she made it. As for baking, she doesn't even know it. But among the people she knows, Chef Zhang Fangfang Art is the best.

In addition, I just received news that Zhang Fangfang was in Qindao from the noon of August 8st to the afternoon of September 31nd. She attended a wedding. She was Zhang Fangfang's cousin, but her parents didn't come back. The wedding was in September. On the 9st, the photos showed that she was driving the BMW when she returned to the piano this time. "

Several people were a little dumbfounded, they messed around, and now Zhang Fangfang became an important suspect, at this time Zhou Ning's cell phone rang, Da Zhao sent a video call request, Zhou Ning clicked through.

"Zhou Xiaozhou, we dismantled Zhang Fangfang's BMW. Wang Hen inspected all the sand and gravel from the gaps in the wheels. The spare tire baffle in the trunk was dismantled. There was no spare tire inside, only two huge garbage bags. Let me show you. , there are everything in it, shoes, gray cleaning clothes, rubber gloves, ignition gun, and a dagger."

As he said that, Da Zhao lifted the dagger with a long pair of tweezers. The black and purple blood stains on it were too conspicuous. You don't need to introduce them. What are they?

"Mark it well and send it for inspection. I'll go down and have a look now. The steering wheel in the driver's seat must be carefully collected samples, so there are no omissions."

"I understand that the steering wheel, gear knob, seat, key, and door handle, I have people use adhesive tape to extract these positions. I am afraid that there will be omissions. They say that any contact will leave traces. I am dead this time. .”

Zhou Ning hung up the phone and glanced at Xu Dayuan.

"Leader, can I talk to you alone?"

"Let's go down and look at Zhang Fangfang's car. We did neglect to investigate this car."

The two went downstairs and came to the backyard. They didn't approach the busy Da Zhao and the others. Zhou Ning handed Xu Dayuan a cigarette, and the two lit it. They didn't speak for a long time.

After a while, Xu Dayuan sighed.

"Is it uncomfortable?"

"Yes, I found out about Shi Yun's experience and the cause of death of Shi Mingchen's family. I was resentful. I thought about what I would do if it were me. After thinking about it for a long time, I brought it into the perspective of a girl. I think I Shi Yun does not necessarily have to do well.

But when the case was investigated and all the evidence pointed to Zhang Fangfang, I was at a loss. Perhaps Shi Yun also had hatred for the police. Back then, if someone intervened and the police intervened, the ending might be different. But even if the news broke out, There was no police questioning either.

You have seen the video sent by Da Zhao just now. I am sure that the things found in the trunk have Zhang Fangfang’s fingerprints and Zhang Fangfang’s DNA. Now she is the number one suspect. What should we do? "

Xu Dayuan took two puffs, threw the cigarette butt on the ground, and smiled at Zhou Ning.

"Remember, we are just policemen, not judges, let alone lonely heroes. Do our best to investigate, correct our mentality, and present all the evidence. This is what we should do. As for how this case is judged, that is not our responsibility." If you are worried, let me ask you a question, when you know Shi Yun's experience, do you have the urge not to investigate?"

Zhou Ning was silent, and it took a long time before he raised his head and nodded slightly towards Xu Dayuan.

"Yes, at the time I didn't want to investigate, I didn't want Shi Yun to be caught, I didn't want her to leave traces, but..."

Xu Dayuan patted Zhou Ning on the shoulder.

"No, but, do whatever you want to investigate. Go and see Da Zhao and the others. I'll go upstairs and talk to Zhang Fangfang. Since I found new physical evidence, there's no need to talk to Zhong Xiaoyan in depth. After the investigation, get off work early. Wait for the result."

With a few words, Zhou Ning seemed to find a direction, and without much greetings, he walked straight towards Da Zhao and the others.

"The survey is over?"

Da Zhao nodded.

"This car was surveyed before, but it was not so detailed. At that time, only Zhang Fangfang's fingerprints were found on the steering wheel and the driver's seat. After the DNA comparison was sent for inspection, because this is not important, I didn't take a photo of it in front. , so there is no result this time.

But I really didn't expect that the murder weapon, clothes and gloves could appear in the spare tire box of the vehicle. You said that if Zhang Fangfang didn't wear it, how could Zhang Fangfang's DNA be left on it? "

Zhou Ning shook his head.

"I don't know. I still can't figure out the process. I'll go to Xiaoqu to see if there are any new discoveries in the monitoring and analysis. You guys should get off work after the inspection."

Da Zhao grabbed Zhou Ning's arm, turned towards the direction where Xu Dayuan left, and asked in a low voice:

"What does the leader mean, let us find the DNA left by Zhong Xiaoyan?"

Zhou Ning shook his head.

"The leader said that it is a matter for the court to do what we should do, to judge and convict. I think it makes sense. Don't conduct investigations based on our subjective wishes. This is biased. Stop talking nonsense and work quickly."

Da Zhao shrugged and let go of Zhou Ning's arm. Zhou Ning came to the laboratory quickly, and some samples had already been sent here. After all, Peng Shinian is the most professional in the analysis of gravel and seeds.

Seeing the busy ditty, Zhou Ning walked over.

"How about it, is there any new discovery on the monitoring?"

Xiao Qu raised a bitter face, looking like she was going crazy.

"Boss, I found Zhang Fangfang's car. After the car accident, I drove westward in the opposite direction. After getting on the Huanwan Expressway, I got off at the Shuangbu Expressway. After a few kilometers to the south, I lost track. .”

(End of this chapter)