National Forensic Doctor

3:30 in the morning.

The phone rang.

Zhang Dinghui opened his eyes immediately, and then he felt his heart beating wildly, and his temples were bulging, as if he was about to break through.

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As the director of the Meiyang City Bureau, Zhang Dinghui received countless calls every day, but there were very few calls in the early morning, especially after 3 o'clock in the morning. Normal people would be asleep at this time, and calls that were not particularly urgent would not come in. It was only during the time when Jiang Yuan came to investigate the bombing case that he received news at 3 o'clock in the morning...

Zhang Dinghui's eyes were wide open, as if a martial arts master was thinking before his death: Jiang Yuan, is really in Meiyang City.

Zhang Dinghui skillfully took out a medicine box from the bedside table, rubbed it open and poured it into his mouth. Then, he pressed his temples with his hands, took two breaths, suppressed the nausea in his chest and abdomen, answered the phone, and said, "This is Zhang Dinghui."

Wang Sheng also knew that it was late at night, so he explained as quickly as possible: "Director. Jiang Yuan confirmed that the suspect Ren Kuangshan abandoned his car in Zhuyuan County the day after the incident, walked along the railway tracks into Zhuyuan County Railway Station, and took the ordinary express 2*** to leave the country."

"Leaving Meiyang City?" Zhang Dinghui was inexplicably relieved.

"Yes, but the investigation in Zhuyuan County still requires our cooperation. Jiang Yuan has already set off for Zhuyuan County. In addition, the leaders of the ministry also set off from Changyang City, and the helicopter they took is expected to arrive at Zhuyuan County Railway Station in about two hours." The last sentence Wang Sheng said was the main reason for the call.

Zhang Dinghui calmed down and repeated, "A helicopter? Is that so hard?"

"It's been five days since the incident. The leaders must be very anxious." As the captain of the criminal police detachment, Wang Sheng understood the feeling of a sudden breakthrough when such a big case was difficult to solve. It was even more exciting than his wife giving birth, and even more excited than his sex partner getting pregnant, similar to the fact that his sex partner's child was not his own.

Zhang Dinghui looked at his watch, understood what Wang Sheng meant, and sighed, "Okay, let's go to Zhuyuan County too."

"Yes." Wang Sheng paused, then said, "I sent a police car to pick you up. It will take about 10 minutes to get to your downstairs."

"Okay. Thank you for your hard work." Zhang Dinghui had nothing to say, so he got out of bed, washed up, and started to get dressed.

"Is there a case?" In the next room, his wife was also woken up. The two of them had slept in separate rooms a long time ago, otherwise, Zhang Dinghui's phone ringing would have caused two heart attack patients.

"Well. You continue to sleep." Zhang Dinghui didn't say much about the case, and he dressed carefully and went out.

Outside the door, the secretary was already waiting.

The car drove very steadily, with a police car leading the way in front. It was more than 3 o'clock in the morning, so there was no need for traffic control.

After sleeping all the way to Zhuyuan County, when Zhang Dinghui opened his eyes again, it was already dawn outside.

"The leader's helicopter will land in 10 minutes. Have a drink of water, and we should go there." The secretary handed over the thermos cup considerately.

Zhang Dinghui drank most of it in one breath, not worrying at all that the water in the thermos cup would burn his mouth.

Power is a cage. When it covers the thermos cup, it will narrow the range of change of the water temperature in the thermos cup. The greater the power, the narrower the range of change of the water temperature.

"Let's go." Zhang Dinghui put on his shoes, adjusted his collar a little, and stepped out of the car door.

Outside the door, his subordinates were already waiting.

"Everyone has worked hard. You must have woken up at night. How is your heart?" Zhang Dinghui nodded to everyone and chatted while walking.

"About the 12 quick-acting heart pills."

"16."

"I used nitroglycerin."

Everyone was talking half-jokingly, and they didn't walk far before they arrived at the place. Without anyone's guidance, they stood where they should stand automatically and consciously.

Woo woo woo...

The noise of the propeller was annoying, and the wind blew up the dust on the ground, and also blew up the smiles of people on the ground.

The helicopter landed.

Song Tiancheng opened his eyes, looked out the window, drank a sip of water, put on his shoes, and got out of the helicopter.

Outside the door, local comrades were waiting.

...

Zhuyuan County Railway Station Police Station.

The Railway Station Police Station vacated the conference room and the director's office, but they couldn't accommodate such a large group of people.

The leaders who came out with people had to work. The leaders could hold a cup of tea and talk with a smile, and the subordinates had to find a place to write speech materials, etc.

Huang Qiangmin led people to greet the leader, and then said: "Jiang Yuan is on the platform to see the scene, I will call him..."

"Don't worry, wait until he comes back after seeing it. We are all here to understand the situation, not to make trouble." Song Tiancheng said, looking around, and then said: "The most powerful clue now is provided by Jiang Yuan. Don't complain about the slowness of the cook."

Turning around, Song Tiancheng greeted Zhang Dinghui again: "Director Zhang, thank you for your help this time..."

This case is not the responsibility of the Meiyang City Bureau, and the latter only needs to cooperate with the work. Song Tiancheng pointed out his subordinates and said something specifically to avoid Zhang Dinghui's misunderstanding.

This time, Zhang Dinghui has been more active than usual, and it is also to give face to Song Tiancheng and Jiang Yuan.

The last time, the gambling house explosion case in Meiyang City was brought by Song Tiancheng and Jiang Yuan, and this is also a favor that should be repaid.

At the same time, Zhang Dinghui and Song Tiancheng had known each other for a long time. Zhang Dinghui smiled and said, "We are kitchen helpers."

"Hahaha." Song Tiancheng pretended to be funny, and his expression was not so serious. After saying a few more words, he turned to ask Huang Qiangmin: "Why did Jiang Yuan come here to see the platform? Isn't the surveillance video clear?"

If the surveillance is not clear, the reliability of the clue will be discounted.

Huang Qiangmin shook his head: "The surveillance is appropriate. However, the train on the suspect Ren Kuangshan is a slow train, and the stop time is very long, 12 minutes. During this period, there is also a train stop in the next lane. Jiang Yuan is worried that the suspect secretly crosses the platform and gets on another train."

Song Tiancheng's eyelids twitched. This answer is a horror story for him as the person in charge of the case. He couldn't help but say: "Didn't you say that the suspect's target is the Northeast? He is also going all the way to the Northeast."

"The normal reasoning is like this. Jiang Yuan is mainly just in case." Huang Qiangmin knew what Song Tiancheng was worried about, and he also thought that Jiang Yuan's speculation was a horror story.

The train next to it was heading east. If the suspect really boarded it secretly, and a group of people from his own side ran to the northeast, it would be a chilling story to think about it.

Huang Qiangmin felt that if he was the head of the special case team, he would have a lifelong shadow if he encountered such a thing. Because Ren Kuangshan would be caught after all. Even if he ran away now, a criminal of this level would definitely be on the red notice in the future.

Therefore, unless he died quietly in a foreign country, otherwise, when Ren Kuangshan was arrested in the future, if he told such a story that went in the opposite direction, even if time had passed, the investigators of that year would never be relieved in their hearts.

Song Tiancheng also became serious all of a sudden: "Jiang Yuan's ideas are rigorous. This guy is a person who was born to be a policeman."

"Now he is called the natural criminal police saint." Zhang Dinghui said a new word he learned.

Song Tiancheng laughed again.

Not long after, Jiang Yuan returned with a group of technicians.

"How is it?" Song Tiancheng was not afraid to show his urgency. He even came here by helicopter, he was really anxious.

"From the situation at the scene, he did get on this train. He got on the 6th car." Jiang Yuan said the information from the video, which was not unexpected.

Song Tiancheng breathed a sigh of relief: "It's good to confirm, it's good to confirm. In this case, it seems that the suspect did go to the northeast."

"From the time point of view, he should have gotten off the train." Liu Jinghui looked at his watch: "We are two days late."

Song Tiancheng's expression moved slightly: "Ge Zhibing has already gone to the border to deploy defenses, I don't know if he can be blocked."

He looked at Jiang Yuan: "Encirclement and interception, what do you need for this part, Jiang Yuan?"

"The train's stop time and location are clear, and the surveillance in each train station is also complete. Now we just need to collect the surveillance of each station to see where the murderer got off the train. I have sent the request for joint investigation to the command center. For this part, it won't take me long to watch the video. It depends on how long it takes for various places to send it over."

Jiang Yuan answered quickly, obviously thinking it over.

The ordinary express basically stops at every station, and it is normal to stop at twenty stations along the way. Even so, even if the stop time is 10 minutes at each station, the total stop time is only 200 minutes. If the time is doubled, it will be 400 minutes. During this period, the total video time of the entrance and exit of a train and the platform, whether it is ten, eight or more, is always a certain number.

When the target person is already clear, Jiang Yuan does not need to watch these videos alone, and a team of image detectives can be organized to watch them together. For qualified image detectives, watching such videos is a daily routine.

In addition, domestic AI systems have been applied to gait analysis as early as 10 years ago. In addition, face recognition can also be used.

The systems at train stations or airports are all adjusted more strictly, and they only remind when the similarity is relatively high. Now that there is a certain time and place, the similarity requirement can be lowered.

As for why it cannot be used at gas stations, it is because the settings and clarity of the monitoring at gas stations are poor, while there are professional portrait camera ports at train stations.

For example, the monitoring of the portrait camera port cannot be compared with the face by just taking a stupid photo. First, it needs high definition, second, it needs fill light, and third, the shooting position must also be facing the face. It can be slightly rotated left and right and up and down, but it is not acceptable to shoot from top to bottom or from left to right.

Therefore, the positions of portrait bayonet and vehicle bayonet are often very particular, and a lot of coordination is required, which are not available in the monitoring of gas stations.

Finally, a large number of surveillance shots mean a large amount of storage or transmission. Assuming that the flow of people is 10,000, it is not surprising that the bayonet takes more than 100,000 photos. There is no problem in accommodating these photos in places where there is demand, but there is no need to do so in places where there is no rigid demand.

Song Tiancheng listened to Jiang Yuan's brisk answer, and his mood suddenly became brisk: "Okay, great, that person, hurry up and call and let each place report the time they need, line up and show it to me, and I will contact them personally."

"Yes." That person did it immediately.

Liu Jinghui said quietly at this time: "When the slow train arrives at the station, we must also prevent the suspect from jumping out of the train in advance."

Song Tiancheng frowned again when he heard this.

Liu Jinghui said again: "Generally, he can't jump out, the train attendants are guarding the door. But if there is a situation, the train attendants may not report it, so we must ask them one by one."

"That's good!" Song Tiancheng breathed a sigh of relief. As long as there is a solution, it will be fine. There are not many train attendants on a train.

"It's better to find some passengers, such as those who bought tickets for carriage 6, and ask them if they have any impression of Ren Kuangshan. People sit on the train for several hours, more than ten hours, and they are familiar with the people around them." Liu Jinghui paused and said, "Ordinary people may just sleep or be insensitive to the people around them. You can pay special attention to the occupations of the passengers. Veterans, those who have worked in the military and police system, including some self-employed people, small vendors, and those who have been in prison, will pay more attention to the people around them, and it is not limited to carriage 6..."

Liu Jinghui is talking about the skills of traditional criminal police. It is not a rare trick, but if it is really used, it will obviously require a lot of manpower and material resources.

Song Tiancheng arranged it without any stumbling. This kind of investigation is a burden for ordinary criminal police teams, but for the special task force, it is like parents teaching children.