National Forensic Doctor

The police dog of the Police Dog Squadron of the Ningtai County Criminal Police Brigade is named Da Zhuang. He is a Rottweiler about four years old, with a strong build, a square face and bald hair. The average daily food standard is 45 yuan.

Compared with the police dog Heizi from Longli County next door, Da Zhuang is younger, more handsome and stronger. But precisely because it is young, it does not have a medal of merit on its chest, and there is no police-citizen joint project behind it. Therefore, its daily food expenses are 30 yuan less than Heizi.

Da Zhuang didn't know this, so his mood was still very stable. When he saw someone coming, his eyes still showed pure happiness, and his tail swayed lightly.

"Da Zhuang, sit tight." The handler probably felt that the police dog wagging its tail was a bit embarrassing, so he came over from the other side of the wall and yelled loudly.

Jiang Yuan followed the sound and looked over, and saw a tall policewoman with long and thin legs, a slim waist and a straight back, turning around.

At that moment... Jiang Yuan felt that her face looked like Rowena.

The face is square, with splayed eyebrows, floppy ears, and almond-shaped eyes that are slightly dark and brown, and seem to have a sad look.

"Li Li, let me use your kitchen to make some fried rice. Do you have rice and eggs?" Wu Jun greeted him without any politeness at all, introduced Jiang Yuan by the way, and said: "My apprentice, the fried rice is quite delicious. "

Li Li nodded politely to Jiang Yuan, and then said: "You pick up a few eggs from the big basket first. There is meat in them. I will ask the food delivery person to make up for them in the afternoon."

Da Zhuang sat up straighter when he heard his name.

This was not the first time for Wu Jun to come to Da Zhuang. He responded with a smile and asked again: "Have you eaten? Let's eat fried rice together?"

"Okay." Policewoman Li Li responded readily and said, "Just in time, I'll make some time to cook for Da Zhuang."

The three of them talked and entered the kitchen of the police dog squadron.

In terms of infrastructure construction alone, the conditions of the police dog squadron are worse than those of the criminal police force. The training ground for police dogs is hardened land, and the surrounding walls are made of the simplest red bricks and cement. Depending on the craftsmanship, it may still be the dog police force. The members themselves did it.

The independent kitchen of the police dog squadron is only two bungalows. The year of construction may be traced back to the 1980s and 1990s. It can only be said that small counties like Ningtai County, which are subordinate to prefecture-level cities, have not made much achievements in competing for the dividends of the times.

The equipment in the kitchen is quite complete, especially the large pot and the powerful stove, which look very professional. However, Li Li pointed to the ordinary small stove next to it and said: "You use that one, over here." It’s for Da Zhuang to cook. How much meat to cut?”

"No need for meat. I can make vegetarian fried rice." Jiang Yuandao: "Just eggs, rice, a little green onion and oil. Do you want to make more for the police dogs?"

"No need. Your fried rice is too nutritious and cannot be given to dogs."

Li Li took out the ingredients from the refrigerator as she spoke. She gave some rice to Jiang Yuan and threw all the pig's trotters into the dog rice bowl; Throw the chopped carrots, broccoli and cabbage into the dog bowl...

The 45 yuan meal standard for police dogs is a pure food expense, just like the 75 yuan meal standard for the meritorious dog Heizi, and the 3 yuan meal standard for recruits. It is also a pure food expense. It does not include water, electricity, gas, or rent sharing. and labor costs. So everyone feels that it is enough.

Under the benchmark, Uncle Seventeen's egg fried rice uses one pound of rice for three people and costs 2 yuan; half an egg costs 5 yuan; vegetable oil, green onions and seasonings, etc., and 8 yuan is enough for the core. In this way, The total cost of this meal for Jiang Yuan and others is 5 yuan, and the per capita food cost is about 8 yuan...

But Uncle Seventeen's LV3 egg fried rice skill still makes this meal look delicious and delicious.

In comparison, Li Li's cooking skills are probably not even at LV1. This can be guessed by looking at the way Da Zhuang sniffs and eats, and the way Li Li devours the food.

"Come here often when you have time." Li Li took a few bites, drank half a glass of water in one breath, then patted her chest and said to Wu Jun: "Team Wu, you hired a talent this time. This is the person who does the work. Can you borrow it from our squadron? Look at Da Zhuang, other dogs are rushing to eat, he can’t wait to be left alone..."

"I don't care about the employment matters." Wu Jun shied away with a smile. He quickly finished the fried rice, stood up, picked his teeth, and said, "We still have work to do in the afternoon, so you can clean up the dishes by yourself."

Wu Jun, who had eaten and drank enough, called out to Jiangyuan and left. He moved skillfully like a regular customer in the Sanlipu alley.

Jiang Yuan looked back at Da Zhuang and saw him eating the forty-five pieces in the basin with a calm expression. Neither fast nor slow, with a calm expression like a car refueling itself.

"The policewoman trained her police dog named Da Zhuang, which is a bit strange." Jiang Yuan chatted while walking.

Wu Jun smiled and said: "It should be the name given by her previous trainer. They also said at the beginning that the first dog was called Dazhuang, and the second dog was called Erzhuang, and they were called all the way. "

"Where is Erzhuang? Are you out on duty?"

"The plan stops when we get a dog." Wu Jun curled his lips and said: "What Team Huang means is that dogs are too expensive. One is enough. With the remaining money, it is better to hire a few auxiliary police officers."

Jiang Yuan thought for a while and nodded in agreement.

noon.

Jiang Yuan lay down and slept for half an hour. When he got up again, he opened the fingerprint of the intentional injury case that Xiao Wang suggested in the morning, opened it into a big picture, and looked at it carefully.

The suspect left four consecutive fingerprints, with different clarity and completeness. The first thing to consider is which fingerprint to focus on.

In terms of completeness, the little finger should have the highest completeness, but its probability of not getting a match is also the highest. Because the probability of taking a fingerprint sample from the little finger is the lowest, many places use the thumb or index finger to apply for temporary residence permits, and the same is true for fingerprint check-ins, etc.

Relatively speaking, the index finger's completeness is the lowest among the four fingerprints left by the suspect. Moreover, its extension is very wide and its deformation is the most serious.

Jiang Yuan pondered for a moment, enlarged the image of his index finger, and began to study it.

The difficulty of marking the little finger fingerprint is relatively low. Of course, because the image is taken in sections from a cylinder, Lao Yan and Xiao Wang may still not be able to do it. However, since they have participated in fingerprint battles in the past few years, then It should still be marked correctly.

Therefore, the main reason why the little finger cannot match is more likely to be that there is no match in the fingerprint database. And this situation cannot be compensated for by technology.

Most likely due to the technology itself, the fingerprint that was not matched was that of the index finger.

This fingerprint is very badly deformed. You can imagine that when the suspect used it to hit someone, his grip must have been very strong, so that some of the fingerprint papillae on his fingers were squeezed together, and some were far apart. It's like a winding mountain road that was flattened by a giant's kick.

Jiang Yuan still opened Photoshop and tried to use Photoshop-CS5 to do "edit-transform".

This step is like restoring the winding mountain road to its original spacing and size on the plane.

Jiang Yuan first fine-tuned the left and right toward the center by 5%. Feeling that it was not enough, he adjusted it to 10%, then 20%, and then fine-tuned it back a little...

There is no specific template for these operations. If there is any reference, the reference line spacing of ordinary people's fingerprints is 52 mm, but this reference value, to be honest, the scope of guidance is really limited, especially if it is based on When fine-tuning is performed in units of 1%, a number representing the average value is of little significance.

On the other hand, because the fingerprints are taken in sections, and the skills of the police at the scene are not very strong, there seems to be problems with the shooting angles of different photos. Normally, it doesn’t matter. Now when I adjust it little by little, It seems that the synchronization is not enough.

Various factors intertwined, making Jiang Yuan try many times but failed.

When he was about to get off work, Xiao Wang ran over again, came to Jiang Yuan mysteriously, and whispered: "I checked, I have participated in three fingerprint battles on this case, but there was no result."

"From the province?" Jiang Yuan paused his mouse.

"The first time was from the province, and the next two times were from the city." Xiao Wang paused, then smiled and said: "The first time was in the era of horse hoof mirrors, and there was no automatic fingerprint system. The second time it has been there , the result is the same.”

A horseshoe scope is a hand-held magnifying glass. The main part is similar to a microscope lens. You need to put your eyes against one end of the eyepiece to see. It has been traditionally used for fingerprint matching, document inspection and even physical evidence search, etc. It can also be used with a camera to take pictures and extract fingerprints. Before the advent of automated fingerprint recognition technology, the horseshoe mirror was the most powerful weapon in the hands of trace inspection.

What Xiao Wang calls the era of hominis refers to the time before the popularization of automatic fingerprint recognition technology. At that time, in the fingerprint battle, fingerprint experts were no longer primates with sparse hair sitting in front of the computer, but a group of people. A thin-haired primate holding a hoof mirror and a fingerprint pad in one hand.

The matching of fingerprints mostly relies on rich experience and memory.

Jiang Yuan nodded slightly after listening to Xiao Wang's words. From his understanding, the current case is a case that has received relative attention, but has not received top-level attention. As for serious injury cases that have reached this level, they have been backlogged for more than ten years. With this level of criminal investigation resources, it is basically over.

"I'll run it again." Jiang Yuan edited the characteristic points of the fingerprint he had just adjusted, and then threw it to the automatic fingerprint recognition system for running.

Soon, a row of candidate fingerprints was listed on the right side of the screen.

Jiang Yuan and Xiao Wang looked through the 20 candidate fingerprints listed from top to bottom. Unsurprisingly, they only found disappointment.

"This is a matter of luck. I guess even if I win, I won't be in the front." Xiao Wang's technical ability is average, but he has some vision.

Jiang Yuan agreed: "Indeed, with such a large adjustment, the order given by the system has little reference significance. The fingerprint ranked 50 may also be the fingerprint of the suspect..."

"If it doesn't work, forget it. I'll look for other cases later." Xiao Wang sighed and walked back.

Jiang Yuan held the mouse in his hand and moved it a little to the right. After thinking for a while, he directly set the number of fingerprints in the candidate review list to 150.

As a result, the number of matching fingerprints given by the system each time will be more than seven times the original number, and the closer the fingerprints are to the back of the list, the lower the probability of matching.

Jiang Yuan was not in a hurry at first. After making a decision, he looked at the fingerprints with peace of mind.

After a while, a translucent system prompt appeared in the field of vision——

Mission: Compete in Liu Yu’s injury case and help solve the case.

Mission content: The victim needs to be comforted, the perpetrator needs to be punished, and both parties need peace of mind. Help them.

Jiang Yuan couldn't help but feel happy. He had originally planned to fight this intentional injury case to death, but now with the system's bonus, he could calm down even more.