Among the various investigation directions, since Jiang Yuan chose to track the driver himself, investigating his escape direction and identity is the top priority.
Jiang Yuan and Liu Jinghui looked at each other, coughed slightly, and said, "First of all, we judge that the murderer is most likely to escape from the country."
Liu Jinghui added: "The murderer clearly knew his target and was fully prepared. Instead of surrendering, he decided to escape. Basically, the only way to escape was to escape from the country."
"And fast." Jiang Yuan added, and continued: "We investigated some stuck points and surveillance after the incident. We can see that the murderer rode his motorcycle onto the national highway and left quickly.
In the surveillance area, the route selected is very targeted and should be a route prepared in advance. But if we talk about routes out of the country, there are only a few routes to escape from the country. The direction in which the murderer rode away is consistent with the northeast direction.
This is one of them.”
The director nodded and pointed out a single direction. Although it needed to be considered, it could be discussed later. Moreover, he himself was not prepared to discuss specific criminal investigation issues.
Jiang Yuan continued: "Secondly, observe the murderer's clothing..."
Jiang Yuan took out a photo of the murderer riding a mountain motorcycle and passing by a national highway.
Several criminal police officers standing behind the director and others immediately stepped forward to look at the photos out of curiosity.
There were too many photos provided on site and the time was too tight. Most people didn't finish them all, or they looked at them too quickly and didn't have time to wrap their heads around them.
The director was also a police officer. He looked carefully at the photo Jiang Yuan took out. He looked up and down for a while, then his eyes lit up and he asked, "Is it because of the boots? Are these boots only needed in winter?"
Liu Jinghui said quickly: "The director has good eyesight. The boots he is wearing are really not suitable for the current weather in Changyang City."
The director's face shone brightly and he said modestly: "Is it possible that he was wearing thick clothes because he was going to ride early in the morning?"
"It's too thick. This is the same model from Taobao. It has velvet inside. It is a special thickened model to adapt to the bad weather below minus 30 degrees. At night in Changyang City, it is several degrees below zero." Jiang
Yuan took out another photo and added: "At that time, you can add the customers of these merchants selling the same style of boots to the investigation list."
The director nodded with satisfaction: "This can indeed be considered."
"In addition, you can also see a backpack hanging on the back of his motorcycle. There are outdoor tents and sleeping bags outside the backpack. In this photo, you can see that the tents and sleeping bags are special cold-proof versions. It is also an overseas route.
Because inspections are stricter in the northwest direction, if you go abroad in the southwest or southeast direction, you don’t need such tents and sleeping bags. It’s too hot and too heavy. The weight that a motorcycle can carry is limited, so there is no need to prepare these.”
The director reacted quickly and said by analogy: "So, he put on boots in advance to reduce the weight. Cold-proof boots are too heavy and take up space."
"Yes." Jiang Yuan nodded and said: "He needs to carry money with him, and he may also need to carry weapons. Carrying outdoor equipment and clothes on the motorcycle is already very heavy. If there are too many things, the off-road use of mountain motorcycles will be difficult.
Sex will be greatly reduced."
"Even so, if he really drives to the Northeast, his motorcycle will be of no use. In the snowy fields of the Northeast, a sled is just fine." After hearing this, a criminal police officer behind him couldn't help but stepped forward to speak.
It is a matter that determines the direction of criminal investigation, and no one should take it lightly.
Liu Jinghui took over the words and said: "There are two possibilities here. One is that the murderer himself does not know the situation in Northeast China and just prepared these things as a matter of course. The other possibility is that the murderer plans to change cars again after entering Northeast China.
This idea is also very practical. If he rides a mountain bike and enters the Northeast, it will take at least two or three days, and it may take four or five days. By then, the local manhunt intensity should be very low. If he is prepared,
With other ID cards and the like, you can even take public transportation.”
"That makes sense." The director followed Liu Jinghui's lead and couldn't help but nod.
Jiang Yuan responded: "The third point..."
"Is there a third point?" The director was surprised and a little happy.
"The third point is to judge based on the footprints. It is mainly used as a reference." Jiang Yuan said this, and then showed several photos of footprints that looked similar to everyone as usual, and said: "Through the footprint identification, I think the murderer
The race is most likely a Northeast Asian ethnic group. In China, this race is mainly composed of Northeastern Han people, Jiaodong Peninsula Han people, and a small number of North China inland and northwest Han people."
Jiang Yuan: "To put it simply, it can be thought that the murderer's ancestral home is most likely Northeast China or Shandong, and less likely North China or Northwest China. Therefore, it is possible that he is familiar with the environment in the Northeast, or even a Northeastern native. If he also aims to leave the country,
, regardless of whether the murderer’s footprints are in the Northeast, Shandong or northwest China, exiting Russia from the Northeast is a safer route.”
Although he had listened to many reports, this time, the director was still deeply shocked: "It is really rare to hear people use this kind of English and academic vocabulary during case analysis meetings."
"I'm a forensic doctor." Jiang Yuan smiled.
The director also laughed: "Do you call this a reference?"
"After all, the murderer's place of origin cannot directly determine the murderer's escape direction. The most important thing at this stage is to mobilize all parties to monitor the murderer's direction of travel." Jiang Yuan didn't talk too much about technology. He analyzed his lv5 footprints.
Even though there were so many powerful criminal investigation teams deployed to the scene, there was not even a single footprint expert of this level.
Moreover, even the few footprint experts in the country who can reach LV5 are not necessarily good at analyzing human race through footprints, and Jiang Yuan's LV5 is comprehensive. Therefore, from this partial point of view, he
Just give the answer directly, there is no room for discussion.
The director did not move forward with just a few words of encouragement like he did before. Instead, he thought about it and decided: "The investigation to the northeast will be left to you, Jiang Yuan. I remember that you were very good at it."
Picture detective?"
"In terms of graphic reconnaissance, I am better at trajectory analysis and image enhancement, and I also know some technical defense and surveillance technologies." Jiang Yuan frankly said what he is good at. His graphic reconnaissance-trajectory analysis is at the LV6 level, but that's about it.
It is limited to trajectory analysis, not as comprehensive as footprint analysis.
Jiang Yuan guessed that the director probably wanted to cooperate with other criminal police teams to do some technical support work.
He doesn't have any objections to this. In fact, he solves some problems from experts from other places on a daily basis, especially the local police stations he has "communicated" with. If you have questions that you are unsure about, he will basically answer them if they are convenient to answer.
.
Criminal investigation technology and ordinary technology are actually the same. They are both things that are not difficult for those who know it, but are difficult for those who don’t know it. A math problem may take hours or even days to complete for those who are good at it. If you are not good at it, you may even need to check the information from scratch.
It may take weeks or even months to learn, but for those who have completed the prerequisite learning, it may only take a few minutes. Questions that take several hours or even longer are already extremely difficult.
.
Jiang Yuan's words were understated, and to the ears of other police forces, it seemed a bit intimidating.
If a young man were to say so blithely that I am good at blah blah blah, and know a little bit about blah blah blah, he would probably receive backhanded ridicule and open ridicule. But how Jiang Yuan handled the case, various stories have long been spread.
The two cases he just handled in Lanyue City used a lot of techniques related to picture investigation. Since Lanyue has a film and television city and it is a series of major cases, the two cases have attracted much attention from both the industry and the public.
It's very high, everyone present knows it.
As for Jiang Yuan's ability to identify footprints, there is no need to explain. There have been too many cases that have affirmed it. At least 30% of the police force present have used it.
This makes Jiang Yuan's answer not appear to be self-bragging at all, but all self-bragging.
"Okay, okay." The director said in an appreciative tone: "As for the picture detectives, you should also participate more, especially when the picture investigators encounter difficulties, you can help them actively solve them. No matter which team is the last to arrest
If you arrest the murderer, you will be credited."
He made his promise clearly.
Jiang Yuan stood at attention and responded with "yes", behaved with full emotional intelligence.
The director suddenly turned his head and said, "Lao Ge, what did you say?"