CHAPTER XXII

"First of all, the identity of the deceased, let's come out of two hypotheses, hypothetical one: the deceased is Sima Yuanying, then the clues we currently have to support this hypothesis mainly include: the wallet left at the first scene and Sima Yuanying's ID card, and the DNA information extracted from the wallet and ID card is consistent with the deceased; Second, the DNA information extracted from the oral residue on the toothbrush in Sima Yuanying's school dormitory is also consistent with the DNA of the deceased; Third, Sima Yuanying will appear at Huangshi Cliff at around 19:00 every night, and has not appeared since the murder on July 18, and there is no camera to capture Sima Yuanying leaving Huangshi Cliff after 19:00 on July 18 to return to school or Blue Moon Community, which means that Sima Yuanying is missing, and he basically cannot have the basic premise of smuggling to North Korea; Fourth, judging from the information provided by Sima Yufan, Sima Yuanying has a 2-centimeter scar on the back of his neck, and the deceased also has a scar on the back of his neck against the left shoulder, but the length is 3.3 centimeters. ”

Dong Chenghai stopped, was a little thirsty because he spoke too quickly, raised the cup on the conference table and took a big sip before continuing.

"Now let's make the second hypothesis, assuming that the deceased is not Sima Yuanying, then there may be two scenarios. The first case is that the deceased is a tiger. Judging from the information we have, Sima Yuanying is a top student of the Department of Philosophy of Mingchuan University, and Huzi is an older rural youth, and the possibility of the two people intersecting is basically 0, so the most reasonable explanation for Sima Yuanying's wallet and ID card left at the scene is that Sima Yuanying intentionally or unintentionally fell, that is to say, the most reasonable explanation is that Sima Yuanying killed Huzi. The evidence includes that Sima Yuanying and Huzi both appeared on Yellowstone Beach at the same time period, and judging from the time, Sima Yuanying did have enough time to commit the crime. However, Sima Yuanying lacks the motive to kill Huzi, there is no possibility of robbing money and robbing sex, and the two have never intersected, let alone have a grudge, if Huzi robbed Sima Yuanying, then according to what we know, it is very likely that Sima Yuanying will not resist. At the same time, the method of crime was high-intensity sulfuric acid, and Sima Yuanying, as a student of the philosophy department, was not proficient in chemical knowledge, and lacked the means to buy sulfuric acid. In addition, if Sima Yuanying is really a murderer, then why did he disappear, if the wallet left behind was deliberately done by him, the purpose was to confuse our sight, he should not disappear, his disappearance is undoubtedly to prove to us that he is the murderer; If he did it unintentionally, then what we know about Sima Yuanying's psychological quality was so panicked that he unintentionally dropped his wallet and fled. ”

The second hypothetical scenario is that the deceased is a third person, in which case Sima Yuanying's wallet is at the scene, and the only possible explanation is that he happened to bump into the murder and was discovered by the murderer. If this is the case, it is common sense to infer that the murderer must have wanted to kill him, and there should be one more corpse on Yellowstone Beach. Of course, it is also possible that the murderer abducted Sima Yuanying, although it is too risky to kidnap Sima Yuanying, but the possibility exists after all. Considering leaving Yellowstone Beach, all other routes except for going to sea will be captured by cameras, and according to our investigation, we have not found anything. And at that time, only Huzi and a group of them went to sea, and the murderer who kidnapped Sima Yuanying would inevitably be discovered by them, and it was impossible for the murderer to kill all 11 people, so the murderer and Sima Yuanying could only go to sea on their boat. ”

After Dong Chenghai finished speaking, he quietly looked at the colleagues in front of him, and the criminal policemen in the conference room were all carefully deducing the reasonableness of Dong Chenghai's assumptions and the sufficiency of evidence.

"There are two hypothetical scenarios in total, and you all have your opinion on which hypothesis is the most likely and the most reasonable." Dong Chenghai asked.

"The first." All the criminal policemen in the conference room, except for Ouyang Yunxi, returned almost in unison.

Dong Chenghai found that Ouyang Yunxi didn't say anything, so he looked at Ouyang Yunxi and said, "What do you think?" ”

"Although it is the most likely and reasonable whether from a rational point of view or from the current situation we have, it is also the most reasonable that the deceased is Sima Yuanying, but my intuition tells me that this is not the case, and there may be some clues that we have not found." Ouyang Yunxi said frankly.

"Yesterday, after you reported the scar on the back of the deceased's neck, I reconfirmed it with Sima Yufan, and Sima Yufan firmly said that the scar on the back of Sima Yuanying's neck could not be 3.3 centimeters. In other words, Sima Yuanying's family did not think that the body on the beach in Huangshi was Sima Yuanying. Dong Chenghai added.

"However, if the deceased is not Sima Yuanying, then why is the DNA information of the oral residue on the toothbrush retrieved from Sima Yuanying's dormitory consistent with that of the deceased? If the deceased is not Sima Yuanying, there is no reason for a highly personal daily necessities like a toothbrush to have other people's DNA information, let alone a deceased who does not know Sima Yuanying at all? Kobayashi asked rhetorically.

"I also think so, Sima Yufan's statement is his personal subjective recollection, which is the possibility of bias, and DNA information is the result of technical detection, from the results point of view, the certainty of science and technology is far higher than the subjective memory of human beings." Shen Qiang added cooperatively.

Dong Chenghai looked at Ouyang Yunxi for a while, then turned his back to look at the case information on the projection cloth, and fell into thought.

"Anyway, we have to continue the investigation, although there are still many doubts, but the existing evidence and clues all point to the deceased is Sima Yuanying, then we might as well put aside other possible assumptions or circumstances, and base the main investigation direction on the assumption that the deceased is Sima Yuanying, of course, this does not mean that we do not investigate other possible assumptions, now I will arrange our next work."

"First of all, since we have confirmed that the deceased is Sima Yuanying, the main direction of our next investigation is Sima Yuanying's social relations. From the point of view of the means of committing the crime, the 7.19 murder is a typical premeditated crime, so the murderer of Sima Yuanying is likely to have a holiday with Sima Yuanying. I, Ouyang Yunxi, and Xiao Lin continue to be responsible for this issue; Second, since the tool of the crime is strong sulfuric acid that is restricted by the state, the source of the murderer's sulfuric acid should be found. Wang Lei and Xu Feng, this question will be handed over to you, you are responsible for investigating all the operators in Linhai City who are qualified to circulate sulfuric acid, and check their sulfuric acid trading records in the past three months. ”

"Finally, Wang Lei and Xu Feng, the direction of your investigation is based on the premise that the deceased is not Sima Yuanying, although it is very difficult, but after all, it is possible, so we still have to continue to investigate. At the same time, you will also be responsible for following up on Huzi and the couple who smuggled him into North Korea with him, and it is best to be able to contact the couple. ”

"The facts of the case are not very clear, and the difficulties are very great, but since the case has happened, as a policeman, we still have to continue to investigate. The next few days are going to be tough, brothers, hold on. Meeting! ”

The criminal policemen in the conference room walked out of the conference room one after another, and they were busy with their own things.

"Yunxi, you book two high-speed rail tickets to Yanshi in northern Hebei Province tomorrow morning, and we will meet the Arctic Bird together tomorrow." Ouyang Yunxi was about to leave the conference room, Dong Chenghai stopped her and ordered.

"Okay." Ouyang Yunxi looked tired and depressed, and agreed without looking back.

Dong Chenghai looked at Ouyang Yunxi, who was leaving, with an inexplicable expression.