The next few days were spent in boring investigation.
Each team conducted investigations according to the set goals. Liu Jinghui redid the time charts of several important personnel. Jiang Yuan began to receive more and more reports of trace evidence, and he was very excited to read them.
It is a luxury to use trace evidence to investigate cases. Generally, criminal police teams only use it on key evidence for major cases. It is not that 500 yuan cannot be paid, but DNA is more cost-effective.
Unlike DNA, even if the conclusion of trace physical evidence comes out, it can only be said that the substance exists here and at this time, and it is still a long way from solving the case.
In contrast, if someone's DNA is found at a crime scene, there has to be a story.
"How's it going?" Liu Jinghui got tired from writing and drawing, so he sat down in front of Jiang Yuan and picked up a box of Chinese that he put on the table.
Jiang Yuan smiled at the sight, turned around and took out a cigar humidor, opened it, gave one to Liu Jinghui, took one for himself, and said while cutting: "There are a lot of trace evidence results, but specifically, maybe
It still needs analysis and analysis.”
"Cigar... I have to smoke it for an hour." Liu Jinghui did not follow the topic just now, but also lowered his head to cut the cigar, thinking while cutting.
"Absolutely. It's just a good time to take a rest and change your mind," Jiang Yuandao said.
"I won't smoke either, it's a waste.
Jiang Yuan took a sip of tea and said "Yes": "The indoor environment is relatively simple, and all the evidence is left, mainly clothes, bed sheets, utensils, etc. If you have the samples taken, you also have them."
If you can see something, like windows and door locks... the murderer must have no way of retreat.
The smoke of cigars is ten times that of cigarettes, and it is smoked continuously or intermittently. When smoked indoors, even if the ventilation fan is running hard, it only takes a short time to make a conference room become shrouded in fog.
Fairy spirit fluttering.
The report of a micro-analysis is not just two thin pieces of paper, but when put together there are hundreds of analysis reports, it is very few. It doesn't look like the homework of scumbag students. He knows that a small part of it is useful, but
You still have to endure it and spend time looking for something that may not be available among a bunch of useful content.
things to use.
"Nickel, copper, chromium, carbon, iron..." Jiang Yuan showed Liu Jinghui the conclusion of several traces of physical evidence taken from under the door lock.
Jiang Yuan said that he stopped and came up.
"Let's take a look." Jiang Yuan pushed back the boxes of reports in front of him.
"Indeed." Liu Jingwen picked up the cigar again and banged it for a while: "Actually, no matter what kind of conjecture it is, the door lock must have been opened unexpectedly. This cannot be understood as a crime committed by someone who is not an acquaintance. Then
He explained to the surviving eldest girl that there were no two murderers, either burglary or housebreaking.
It is relatively common for robberies to be carried out by a small number of people...well..."
"What does it mean?"
When the smoke dissipated, Ke Yuan also raised his head: "It's very unlikely, very unlikely! It's a very bad guess."
If a young technician had said that, it would have been unconvincing, but when Jiang Yuanna said it, Liu Jinghui immediately stopped following my train of thought.
"It's very unlikely." Jiang Yuan looked at the horse hoof mirror again and nodded: "It's very possible that he got a key first, opened it, then took it back and sharpened it with a file, and then came back and tried again, and it still opened. If you open it, then go back and sharpen it with a file. That can better explain the small and big changes in the key. The file sharpens the key.
It’s a little bit longer, and the degree has also dropped, but the length has basically changed!”
Ke Yuan listened to the sound and looked at Liu Jinghui: "What do you think of?
"But out of range? Beyond the range of anomalies?"
"What if I want you to analyze it for him?" Ke Yuanzhi took a puff of the cigar, let the smoke swirl around the outside of his mouth twice, and then spit it out. Even if he smokes cigars, naturally I just say it carefully. If the provincial expert How can you help the tobacco department fight crime if you can even smoke cigars?
Liu Jinghui pressed: "A new lock-picking tool? Doesn't this mean the goal is clearer?"
Ke Fan nodded vigorously: "The scratches in the keyhole are in the form of scratching and polishing; scratching and polishing, and scratching and polishing again, that's why it looks so strange. For example, no one opened the door with a new key. , no matter whether I opened it or not, there was no serious scratch on the inside of the keyhole, but it was broken before.
The process of unlocking is equivalent to polishing part of the scratch..."
The process of unlocking is equivalent to polishing part of the scratch...
Liu Jinghui thought about that, shook his head vigorously, put down his cigar, and said: "You can think about it from that direction.
Jiang Yuan nodded hurriedly and guessed, as long as there is no possibility, then it will be the same.
Liu Jinghui had no such conjecture for a long time, so he asked him to re-investigate the man's relationship network. Only if there was no conclusion, he did not find out the direction of the investigation. At this time, Jiang Yuan suggested that Liu Jinghui would naturally add that possibility.
"Same for me. Dad bought it and I played with it. There's nothing wasted. It's just agricultural products from Cuba. It was first given to me by the businessman who sold the breeding cattle when Dad bought cattle." Jiang Yuan was chatting. , lit the cigar.
"So no one used the new key to open the door?" Liu Jinghui patted his calf, feeling suddenly enlightened.
Liu Jinghui's reasoning was very muddy and directionless. Ke Yuan couldn't help but nod. It was indeed not possible.
"He took a few bad points under the windows and door locks?" Liu Jinghui understands the "" analysis report in the scientific sense, but I don't have my own way, just like Jiang Yuan.
There was less smoke outside the meeting room.
"An acquaintance...or someone who is familiar but has access to the key." Liu Jinghui nodded: "Come and make a list!"
Liu Jinghui became excited when he heard this: "If that's the case, the murderer must be someone he knows. The victim didn't have much money at home, and he didn't lose any valuables. The murderer must be someone he knows, so we need to keep an eye on him." It was placed in our house. From that point of view, it is very unlikely that the murderer came through someone
Through this method, I got access to the key to the victim’s house, and then got one myself, and then I kept trying?”
.Isn’t Hui Gong there? Jing Tu asked
Gong Yuan simply pulled the whiteboard, drew a keyhole on the bottom, clicked on a few more points, and said: "You guys have removed the lock, because in your opinion, there are still too few scratches in the keyhole. , exceeding the level of abnormal locks. Of course, that judgment is based on experience... Next, you guys
After taking some points around, we can see that the range where various metal elements appear in the lock is beyond the range.
Sing...Although it is exactly like that, you can't add another one, and the newly matched key is a bit rougher. Although the person who makes the lock will polish it, the grooves under the key are very thin, even if they are polished carelessly, it will not look good. It can be completely smoothed, so it will take a few times to get a better fit...
That might be the truth
"The newly issued key can explain a small number of fine scratches." Jiang Yuan had been thinking about this idea for a few days.
Ke Yuan nodded: "Elements such as chromium and nickel are at most from the lock itself. However, there are no traces of typical technical unlocking in the lock. Therefore, it cannot be understood that it is brought by the key."
A fine standing mirror, a dismantled horse and hoof gear
Liu Jinghui: "You mean, we were just talking about a new key? Isn't it more reasonable to have a new key than inventing a brand new lock-picking tool that he already knows?" The razor theory, if you can use a complex explanation, use a simple one.
In fact, all the windows in the conference room had been opened long ago, and the ventilation fans were working hard. Liu Jinghui asked people to step back, and each person took a fan or useful documents to fan them hard, and threw both cigars out of the door.
"Speaking of that, you don't have an idea." Liu Jinghui simply pulled up a whiteboard and said: "The murderer this time was a mismatched key... You know, he just said that the scratches on the newly matched key may be that small. , this is impossible, the murderer has been matched very few times... Yes, it should be matched very few times
If the key is poked once, can it be opened? Poke it again or replace the key and try again?
"Yes, you have been doing research in that area for the past few days. If there is no new lock-picking tool, you think the murderer will be able to bear it. Maybe he will give up after using it only once." Jiang Yuan said Looking at Ke Fanzhi, he decided to be more rigorous: "Of course, it's not that rigorous to eliminate the murderer.
Shen, but if that’s the case, it will be difficult to find the murderer using lock picking tools..."
Gong Yuan: "The size of the key that the murderer matched is determined. It may be a little longer or smaller than the original key, which will cause deeper scratches. The marks in the lock cylinder are consistent with the one-time use of the new key. The traces of unlocking are even too consistent with the traces of unlocking several times, but if they are consistent with the traces of unlocking a few times, it is definitely
There are traces of early unlocking. There is nothing like a forensic test wound, indicating that the prisoner tried to open the door many times after committing the crime. The time of the trial may be as long as one, two, two or eight months. "
"That reasoning makes no sense," Liu Jingle said, then became a little more serious and said, "Yes, if the man opened the door and then had a conflict with the person who left the door, the mother would hide the son and then go out to help. The boy was forced into the bedroom and murdered. Such a hypothesis would be more serious.
Can you explain why you hide your son and hide your man?"
"Huh?" Jiang Yuan answered.
Jiang Yuan and Ke Yuanzhi had sex for a while, and it was like 20 criminal police officers having a meeting together. At this time, the two people outside the conference room looked at each other and suddenly lost the desire to discuss.
"Locks are developing very fast... Well, he can't follow his line of thought to check. The murderer may have dared to sell the old lock-picking tools, or continue to use them, but it is impossible to make a living from this and specialize in studying those tools. Something in the field, or opening a company?" Jiang Yuan said with certainty.
That condition sounds complicated, but it's actually very narrow. In theory, people from all lock companies, people in the locksmith business, people in the safe business, and people in the electronic lock-related industry chain that are not yet popular are all within the scope. If the list is too small, people will be missed. Even if you look for Xu Taining, you can check it.
This kind of.
Theoretically, if the murderer really has no talent in that area, I will be able to make such a new lock-picking tool that Jiang Yuan will definitely be able to make in 10 years. Today, 10 years ago, I might have been in the mechanical or other field. I have excelled in any field, and it is basically just to express my talent in that field.
"Of course. There are not many reasons to hide the son or the man." Liu Jinghui then added: "It's not possible that the man is too young. There are only two places in the bedroom that are difficult to hide people. , the closet and under the bed. The 8-year-old girl hid outside the closet and piled up clothes.
He couldn't hide. The man's height and body shape meant that even if he wanted to hide, he would basically be able to hide on the bed, and the bed was somewhat sheltered. In that case, it would be impossible for the man to hide but be discovered and grabbed. come out."
Jiang Yuan had to pour hot water on me and said: "With that complexity, you must only open the door once, and it should leave such few and extensive traces. If it is a newly issued key, it may take more than a dozen times. Even after one or seventy times, there are only a few small traces left, especially the protruding traces.
So, it feels like a new type of lock-picking tool..."
I am more aware of the practicality of Jiang Yuan's plan than Jiang Yuan. Maybe we can't do it in reverse, first determine the list of suspects, and then see if we don't have any work direction related to locks, or theft and burglary suspicion and reputation
"Although a small number of people are involved in burglary or housebreaking, they must be a fixed group, but if they are all experienced people, especially those who are not capable of technical lock-picking, they may stop after just one case, even if they kill someone. It's also possible that he used a new invention to commit a crime for the first time, and then gave up.
Do great thieves have such bad self-control?" Liu Jinghui shook his head. Being a thief is a painless profession. Once many people take up that profession, they will give it up. It is an evergreen tree outside the criminal system.
The smoke from the cigar was so thick that it affected Jiang Yuan's observation.
"If you are tricked into opening the door, you will hide your son." Jiang Yuan naturally thought about it.
"How to say it." Ke Yuan took a moment and said: "From the perspective of trace physical evidence, that conclusion is actually unable to provide a decisive result. But from the perspective of investigation and analysis... although the appearance of those metal elements is very abnormal , yes, the elements obtained for the first time are very few..."
Liu Jinghui smoked his cigar, constantly puffing out thick smoke.
"That can't be proven?" Liu Jinghui guessed and thought that it could be proven technically. I have always relied on arresting people and bringing them back for interrogation.
The magnification of the horseshoe mirror was low. Jiang Yuan frowned and shouted: "Open the windows, open them all, and disperse the smoke."
"You need to understand what he means first...the metal elements you mentioned are brought by the key and belong to the lock itself?" Liu Jinghui grasped the key point immediately.
And if you want to conduct a positive investigation, it is still difficult to find the murderer by linking the murderer with the lock. Because making locks, or developing a new kind of locks, is not actually a profitable business. Doing burglaries is not a profitable business. A big thief is obviously a life-long career that is disposable.
For example, if the meeting lasts until that time, it is like drinking until you wake up slightly. If you finish the meeting and talk about something, otherwise, it will be bad for Xiaojia's health to stay up any longer.
Suspicion is far away, if there is no suspicion, it is history and reality, and the actual standard is faced by others.
If the murderer is the murderer 10 years later, if someone of the same age as the boy is the murderer, if we calculate the time, the murderer will have just graduated from a bad undergraduate degree. He must have gone to a bad school for graduate school, and studied the same major with his bad mind. possible.
Ke Yuanzhi thought about it, smiled evilly at Jiang Yuan, and said: "What do you think of the technical unlocking idea? Let's go ahead a little bit."
"You get more excited when you talk about that." Liu Jinghui realized that the topic had been taken astray at that time. He laughed and turned around and said: "He just mentioned the way to break into the house, and it immediately reminded you of the secret room murder part. Well, What did he find under the locks and windows?"
Ke Yuan's eyes lit up after hearing this: "Wait for you to see.
"It exceeds the key range of the lock." When Jiang Yuan said that, he slapped his forehead: "Is it a newly assigned key? That's right. A newly assigned key will leave few traces."
"Wait a minute, let me understand it a little more!" Liu Jinghui was very interested in any new clues, and said while thinking: "Yes, you can't say that, the new key is actually smaller than the original key, so The deeper the traces, the deeper the traces?"
"What if the suspect opens the door to enter, or is tricked into opening the door?" Ke Yuanzhi reminded.
