Chapter 287 The Doubt That Meng Qinghan Discovered (6)
"But my colleagues in the laboratory found conclusive evidence in the fecal samples of this mad dog."
"oh?"
Deputy Director Yang immediately said: "What is it?"
Xu Tiannan said.
——"After this test, we found that the components of canine coronavirus were found in this fecal sample."
——"This virus is relatively common and relatively mild in nature. It will only cause minor complications in most adult dogs, with symptoms such as diarrhea, vomiting, and bloody stools at most."
——"Although this chronic virus is relatively common in many dogs, we can get a very important clue."
——"That is, after being infected with canine coronavirus, this dog will have the habit of diarrhea everywhere. This situation is very beneficial to us, so I can be sure that in the area where the murderer raised this mad dog, there will be traces of
A soil sample of the dog's blood."
——"So we must seize the time now and lock in the scope before the murderer completely cleans up the place where this mad dog was raised. As long as the same feces sample and the blood sample contained in the feces are found in a certain venue, it will definitely
This is the area where the murderer raised this mad dog."
After saying this, everyone couldn't help but feel a little excited. After all, they have now got a general direction of investigation. What everyone fears most in handling this kind of case is to run around like headless flies, endless visits and investigations.
, and still gained nothing in the end.
But soon, a police officer raised objections and asked: "Excuse me, Mobei City is so big, we can't go one by one to investigate the breeding area of this mad dog, right? That's too unrealistic."
Xu Tiannan nodded and signaled: "That's right, so in the next step I will initially lock in a survey range for everyone."
After finishing speaking, Xu Tiannan projected a map of Mobei's urban area on the big screen, and quickly used a marker to cross out "Beicheng District", "Nancheng District", "Dongcheng District", and "
"Downtown" and other four areas, and explained: "These four areas cannot be the location where the murderer raised this mad dog."
As soon as these words came out, even Deputy Director Yang's face was full of disbelief, and he said doubtfully: "Teacher Xu, you have screened out almost three-quarters of the entire Mobei City at once. Are you sure that the murderer only knows
Are you raising this mad dog in the Xicheng area?"
Xu Tiannan nodded, "The reasoning we usually use in handling cases may contain personal subjective emotions and the principle of probability, but for science, the conclusion is the only one. Please take a look at the 4 I crossed out on the map.
There is one biggest difference between this area and Xicheng District, can you see it?"
After everyone was silent for a moment, Meng Qinghan suddenly said: "The water plant that supplies Xicheng District is not the same water plant as the other four districts."
"That's right!"
Xu Tiannan responded and explained: "Because Xicheng District is close to the Gobi zone on the border road, the water plant that supplies Xicheng District is different from the water plants in the other four urban districts. The water source used by the water plant in Xicheng District is deep groundwater, while the water plant in the other four districts
Because this area is geographically close to Beiyang Mountain, lake water is used.”
A police officer wondered: "Then...what does this mean?"
"Everyone, please take a look."
With that said, Xu Tiannan opened another experimental data on the big screen. The many professional terms and calculation formulas on it made everyone dizzy, and then explained.
——"Although this experimental conclusion seems a bit dazzling, it can be summed up in one sentence, that is, whether humans or animals, the largest component they contain is water, and 99% of the water in our bodies comes from
drinking water."
——"Therefore, this time I brought the urine sample of the mad dog back to the laboratory of the University of Political Science and Law, and the researcher also conducted a test on the composition of the water in the urine."
——“Because groundwater and surface water have different pressure levels, chemical reactions, and light levels, researchers can find different regional distribution patterns of groundwater after comparing environmental isotopes in water samples.”
——"Among them, the water tritium content in the water source samples in the central, northern, southern and eastern urban areas is greater than 20tu, while the water tritium content in the water in the urine of the mad dog is between 5tu and 10tu."
——"Therefore, based on the fact that the t value of deep water is significantly lower than that of surface water, it can be seen that the water source this mad dog usually uses must come from groundwater and not lake water."
——"The only water plant that uses underground water source is this one in Xicheng District. In addition, this dog likes to roar when no one is around, so we can draw a conclusion."
——"The murderer behind the shooting in Hongdu, Mobei, must be this mad dog raised in Xicheng District. It cannot be kept in a residential area, but should be kept in a spacious warehouse, factory, breeding farm, etc. that will not cause disturbance to the residents.
troubled empty areas.”(Note)
After the conclusion of the experiment, most of the police officers' faces were full of expressions of "I don't understand this." But regardless of whether everyone understood it or not, at least now Xu Tiannan has locked the investigation direction of the case to only
It covers Xicheng District.
Therefore, after some thought, Deputy Director Yang immediately ordered.
——"I think everyone already knows the general circumstances of the case and the direction of the investigation, so I decided that this case will be jointly investigated by the First Investigation Team and the Second Investigation Team."
——"A large team of Xiao Meng is in charge, and the main goal is to investigate veterinary stations and unemployed people across the city."
——"Xiao Wen from the Second Brigade is in charge. The main target is all areas in Xicheng District that meet the boundaries defined by Teacher Xu just now. At the same time, we will strictly investigate all relevant personnel who left the city today. The face of the escaped Usopp is very distinctive, and he will be issued immediately.
To the police officers at each checkpoint."
——"The case is urgent, so everyone canceled their vacation and returned to the team immediately. We must fight to the end with this suspect who dares to challenge the police. We must win!"
Everyone immediately accepted the order and promised to complete the task, and then returned to the command room of the brigade.
After Xu Tiannan hurriedly packed up the materials on the podium, he immediately walked in the direction of Murong Shui and said in a small voice: "Gen'er?"
Murong Shui twisted his neck at an incredible angle in annoyance, without even looking at the other person.
Xu Tiannan felt that this was a bit troublesome, so he had no choice but to bite the bullet and said cautiously: "How about tonight...hot pot? Spicy? The kind with enough fat beef?"
Seeing that the other party ignored him for a long time, just when Xu Tiannan felt that he was in serious trouble this time, Murong Shuique's stomach suddenly growled for a while, and then he turned his head away in embarrassment, but when he spoke he still sounded like
The interrogator asked: "Boss! Are you really investigating the case yourself these two days?"
Xu Tiannan thought for a while and responded in confusion: "Of course I'm not the only one? What's wrong?"
Murong Shui's eyes suddenly brightened, and then the corners of his mouth began to twitch slightly in grievance. He was speechless for a while, but Xu Tiannan finally realized that the other party was asking about his identity, so he hurriedly lowered his voice and said: "I'm going! I'm going to
I seem to understand what you said, do you think I went to investigate the case with...Meng Qinghan?"
After a while, Murong Shui held back the expression that was about to cry and nodded hard.
Xu Tiannan knocked Murong Shui on the head unceremoniously and comforted: "Are you a fool? I mean I have been staying with the people in the laboratory for the past two days, who said I was with her!"
"Well?"
When Murong Shui heard this, he finally reacted and asked hurriedly: "Really...really? You are not with her?"
Xu Tiannan immediately shook his head and said, "What are you thinking about? How could I investigate the case with her?"
"That……"
Murong Shui lowered his head and muttered something in a small voice. Xu Tiannan didn't hear it clearly, so he asked, "What did you say?"
After a while, Murong Shui mustered up the courage and said in a small voice: "Then will you and her get back together again in the future?"
Xu Tiannan almost choked. Sitting next to him, he pointed his thumb at himself and said seriously: "Shui Gen, let me tell you, the possibility of this happening is even greater than the possibility of Fourth Master dumping Li Mengxue."
The sex is low, and as a good horse, it is impossible for such a thing to happen again, do you understand?"
Murong Shui lowered his head and thought for a while, his dim eyes gradually regained their light, and then he said pitifully: "Then... do you still want to eat hot pot?"
Xu Tiannan nodded hurriedly and said: "Eat, eat, walk."
However, just when the two were about to stand up and leave, they suddenly heard Meng Qinghan's voice coming from behind.
"Brother Nan."
Xu Tiannan's heart suddenly sank. He turned around and asked, "Ah... what are you doing?"
Meng Qinghan raised the notebook in his hand and said, "Your analysis of the case today was very exciting."
"Thanks."
After Xu Tiannan finished speaking, he was about to leave, but was stopped by the other party. Meng Qinghan suddenly asked: "Then I want to ask you, did you bother to investigate the murders that occurred in Mobei City in the past few months?"
The atmosphere between the two suddenly changed, and Xu Tiannan responded seriously: "What on earth do you want to say?"
Meng Qinghan looked into the other person's eyes and said bluntly: "As far as I know, you have already handled several freezing cases in the past few months, right? This is not your style, and I don't believe it.
It’s your ability to handle cases.”
Xu Tiannan thought for a moment, but did not respond directly to the other party. Instead, he explained: "That's why you are sent to us this time at the request of the superior department to continue investigating these cases. If nothing happens, I will leave first.
hungry."
After the two left the Public Security Bureau building, Murong Shui looked a little hesitant and said: "Boss, is she really... your ex-girlfriend?"
Xu Tiannan frowned and said, "Look, why are you talking about her again!"
Murong Shui: "No, boss, I don't mean anything else, I just feel... why does she seem to be targeting you?"
Xu Tiannan responded without thinking: "Yes? Why don't I think so?"
"Yes..."
After Murong Shui got into the car, she still had a thoughtful look on her face, and after a while she murmured to herself: "Whether it's aimed at you or not...it's hard to say, but I didn't notice it in her eyes.
That look."
Xu Tiannan: "What's that look in your eyes? Damn it, are you creating some micro-expression theory of your own?"
Murong Shui: "It's that kind of... the look in a woman's eyes when she sees the man she likes. Anyway, I can't see it."
"nonsense!"
Xu Tiannan muttered dissatisfiedly: "She dumped me back then, and I'll be damned if I have this expression again. Eh? What do you think I'm doing?"
Xu Tiannan found Murong Shui looking at him with a smile. After a while, he heard the other person laugh and say: "So you are the one who was dumped?"
"So many words! Do you still want to eat hot pot?"
"Eat! Eat! Leave now!"
Murong Shui took a long breath and started the car. At this time, she finally felt relieved. After all, in her single value system, she knew that Xu Tiannan was a person who wanted to save face. If he was dumped by the other party,
Even if a comet hits the earth and destroys mankind, Xu Tiannan will never go back to find him again."
The atmosphere in the car became relaxed again, but Xu Tiannan had a faint murmur in his heart. He didn't know what had happened to Meng Qinghan in these years and why his personality had changed so much.