National Forensic Doctor

The next few days were spent in boring investigation.

Each team conducted investigations according to the established goals. Liu Jinghui redid the time charts of several important personnel. Jiang Yuan began to receive more and more reports on trace evidence, and he was very excited to read them.

It is very luxurious to use trace evidence to investigate cases. Generally, criminal police teams only use key evidence for major cases. It’s not that 500 yuan is unaffordable, 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.

By contrast, if someone's DNA is found at a crime scene, there has to be a story.

"How is it?" 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 many results of trace physical evidence, but specifically, maybe It still needs 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 "En": "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 the windows and door locks... there must be no way for the murderer to escape.

The smoke of cigars is ten times that of cigarettes, and it is smoked continuously or intermittently. When smoking 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 does not look like the homework of scumbag students. He knows that the small parts outside are 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.

something to use.

"Nickel, copper, chromium, carbon, iron..." Jiang Yuan showed Liu Jinghui the conclusion of several points of trace physical evidence taken under the door lock.

Jiang Yuan said that he stopped outside.

"Let's take a look." Jiang Yuan pushed back the boxes of reports in front of him.

"Indeed." Liu Jingwei 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, Keyuan also raised his head: "It's very unlikely, very unlikely! 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 it 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 bigger, 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 you 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 I know how to smoke cigars, I am of course just saying it carefully. If the experts from the provincial department can even smoke cigars, how can they help the tobacco department fight crime.

Liu Jinghui pressed: "A new lock-picking tool? Does this mean the goal is clearer?"

Ke Fan nodded vigorously: "The scratches in the keyhole are in the form of scratching, polishing; scratching, polishing, scratching and polishing again, that's why it looks so strange. For example, no one used the newly assigned key to open the door. , 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..."

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 suspicion 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 again. At this time, Jiang Yuan proposed that Liu Jinghui would naturally add that possibility.

"Me too. 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 merchant 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 outside his home, and he didn't lose any valuables. The murderer must be someone he knows, so it's necessary to keep an eye on him. It seems that the murderer was released through someone.

In this way, 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 to remove 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 Xiaofan

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 it is polished carelessly, it can still be It's completely smooth, so it will take a few passes to get a good fit...

That might be the truth

"The newly matched key can explain a small number of fine scratches." Jiang Yuan had been thinking about this for a few days.

Ke Yuan nodded: "Elements like 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: "Are you saying that 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 everyone knows about?" The razor theory, if it can be explained in a complicated way, it must be explained in a simple way.

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, "Suppose the murderer matched the 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 resist using 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.

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 traces 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 match the traces of unlocking a few times, it is definitely

There are traces of early unlocking. That one doesn't look like a forensic test wound, which shows that the prisoner tried many times after committing the crime. The trial period may last as long as one or two months, or two or eight months. "

"That reasoning makes no sense," Liu Jingle laughed, and then said more seriously, "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. Is that assumption even more serious?

Can you explain why the son is hidden and the man is hidden? "

"Huh?" Jiang Yuan answered.

Jiang Yuan and Ke Yuanzhi smoked for a while, and it had the effect of 20 criminal policemen having a meeting together. At this moment, 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 lock-picking tools, or continue to use them, but it is impossible to make a living from this and specialize in those tools. Something about it, or starting 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 haven't yet become 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.

of this kind.

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 working on machinery or other tools. I have excelled in any field, and it is basically used to express my talent in that area.

"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 8-year-old girl is hiding outside the wardrobe and under the bed.

He couldn't hide. The man's short stature and body shape mean that even if he wanted to hide, he would basically have to hide on the bed, and the bed would have some kind of cover. 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: "It's so complicated. You must only open the door once, so there should be 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 traces of protrusion.

So, it feels like a new type of lockpicking tool..."

I am more aware of the practicality of Jiang Yuan's plan than Jiang Yuan. Maybe we can't work in reverse, first make a list of suspects, and then see if we don't have any lock-related work direction, or have suspicion and reputation for theft and burglary.

"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.

Does a big thief have such bad self-control? "Liu Jinghui shook his head. Being a thief is a painless profession. Once many people start that profession, they will give it up no matter how difficult it is. They are 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 tell." 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 always rely 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.

However, it is still difficult to conduct a forward investigation and find the murderer by linking the murderer to the lock. Because making locks, or developing a new kind of locks, is not actually a profitable business. Being a burglary thief is obviously a disposable lifelong career.

For example, if the meeting lasts until that time, it is like drinking until you wake up slightly. If the meeting is over, let's talk about something. Otherwise, if you continue to stay up, it will be bad for Xiaojia's health.

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, the murderer will be the same age as the boy. Calculating the time, the murderer will have just graduated from a bachelor's degree. It is said that 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 mischievously at Jiang Yuan, and said, "What do you think of the idea of ​​technical lock opening? 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, which immediately reminded you of the secret room murder part. Well, What did he find under the door lock and window?"

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 issued 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. It is recommended that you go to sᴛᴏ𝟻𝟻ᴄᴏᴍ to read the latest chapters of this book, so that you can experience an extraordinary experience without errors or disorder.