New students report and school starts.

One by one, the freshmen who had just entered the police academy were very excited and couldn't wait to change into police uniforms. Four years of police academy life began.

Police are a profession that requires dedication and sacrifice. The student police are not formal police officers, so there is no need for them to contribute for the time being, but "sacrifice" has begun from this moment.

No division of squads, squadrons, brigades, and militarized management.

The same clothes, the same bedding, and the same hairstyle. Boys should not have more than one finger. Girls have short hair with their ears, but not their eyebrows in front and collar in the back.

The first level of entering the school was a 42-day military training. Before dawn, I was awakened by the whistle and started a day of "devil training". Running exercises, pulling exercises, walking in the queue, standing in the military posture, and kicking in the pedal...

At the end of the day, many new students seemed to have fallen apart and their clothes were covered with sweat stains.

The happiest thing they have every day is that the instructor announced the "disbandment", and ran to the cafeteria with a speed of 100 meters, completely throwing the requirement of "two people in line, three people in line" behind them. Xinsheng, who usually has a small appetite, now has an amazing appetite, and his stomach is simply a bottomless pit. He has no fullest, only fuller.

They always look forward to the rain so they don't need training.

However, you cannot be idle without training. You must organize your internal affairs. Folding quilts is a compulsory course, and you must fold the quilts into "tofu blocks".

When it rains, there are people stepping on quilts in the dormitory and corridor. First spread it out and then stroke it, then use a ruler to mark the quilt, strive to be accurate and accurate. After folding it, you must pinch it a little bit to standardize and beautiful. After one set of steps, everyone is sweating profusely.

It is said that a freshman was lazy and watered the quilt, but the instructor slaps him hard. No one dared to follow You.

The most painful thing is the emergency meeting in the middle of the night.

Late in early autumn, there was a hint of coolness, and the emergency gathering whistle suddenly rang, and they were all in a hurry to wear it, rushing out. Often you wear my clothes, I wear your pants...

Although the name is on the roster of the graduate team, all this has nothing to do with Han Bo.

Part-time instructors seconded from grassroots practical departments are equivalent to on-the-job graduate students and there is no need to participate in military training.

There are several classes a week, and the law major studied at Public University is different from natural sciences. It does not require various experiments. The study and work of graduate students and instructors of Public University is very easy, and they don’t even have to come to school every day.

He was wholeheartedly preparing to take the unified examination. When he was tired of reading books in the major of biochemistry and molecular biology, he read monographs from professors, associate professors and lecturers in the Economic Investigation and Research Department, including his mentor. In the evening, he called Cheng Wenming, the "lonely hero" who was tracing the 4.19 case in the rural areas of Yuanhaigang City to learn about the progress of the investigation and understand where he is.

In addition to the April 19 case, he turned a blind eye to the outside world and only read two major books. He did this every day for more than two weeks, and gradually got used to such daily routines.

However, such a peaceful life was quickly broken.

Tomorrow, Mid-Autumn Festival, I will take the mooncakes home. Lao Lu, who had just left school and disappeared for a few months, appeared in BJ again. He called and said that he had just got off the train and asked if he was at work or at home, and he would have to pay for the plane ticket from the capital last time.

Air ticket money is a small matter, and it is a big matter for others to arrive at BJ. It must be received and it must be received well. Otherwise, when you go back to Liangzhuang, someone will be scolded behind your back.

The BJ company of Construction Engineering Group sent a car to pick it up, so there was no need to rush to the train station, and the driver directly went to Furui Apartment.

He couldn't wait, and he didn't take the bus, so he quickly got there. He rushed downstairs of the community and waited for more than ten minutes. He arrived and brought a military officer from Liangzhuang.

"Xiao Han, don't do it, we've eaten it."

The outfit is still very casual and sporty, and the point-and-shoot camera is still hanging on the chest. When I came in April, I only had one backpack, but now there are two more suitcases, which are stopped when I moved down from the car.

Send the driver away, he curiously observed the living environment of the "old subordinates" in the capital, and emphasized: "I have eaten it. Before getting on the train, Director Zhang's wife prepared a lot of cooked dishes, so we can't waste it. We ate all the way and drank all the way until we got off the train."

When Liangzhuang Township was upgraded to Liangzhuang Town, Director Zhang of the Political Department of a regiment of the People's Liberation Army not only went back, but also visited Liangzhuang Police Station. He met him and said hello just now, so there was no need to introduce him at all.

Director Zhang dragged the trolley box and smiled: "Xiao Han, Secretary Lu is not kidding. If you are not hungry, can we be polite to you?"

"Then go upstairs to rest first and have a midnight snack at night."

The fifteen-story high-rise building, Lao Lu felt a little exaggerated and couldn't help asking: "Xiao Han, are you living here?"

"Well, 12th floor, I just called Xiaolei and I heard that you are so happy that you are here. She is on the way back and is not allowed to go to the Beijing Office with Director Zhang. You will stay in my house at night and have an available room. You will know when you go up."

"This girl is so polite." Old Lu smiled proudly, took the cigarette and asked, "Where is your father-in-law living?"

"The alley in front is not far from this, ten minutes walk."

“It’s quite close.”

"I bought this place because I'm close to you. Let's go upstairs first. It's not a place to talk outside."

He didn't live with his father-in-law and mother-in-law, so Lao Lu had no scruples and was no longer polite. He agreed quickly. He was unlucky, so Director Zhang naturally wouldn't leave. He said a few polite words, walked into the community together, took the elevator to the twelfth floor.

Lao Lu put down his backpack, opened all three rooms to see, and returned to the living room and smiled, "Standing high and looking far, commercial housing with elevators. Xiao Han, how much does this house cost, it will cost about 200,000 yuan."

Han Bo took out two cans of drinks from the refrigerator and found a small plate from the kitchen to use as an ashtray for him. He said with a look of embarrassment: "BJ house price is expensive, 200,000 is not enough. Including the parking space downstairs, it is more than 700,000 yuan, and the decoration is not calculated."

"More than 700,000!"

"If you have a loan, you will pay more than 100,000 yuan first, and pay the remaining ones slowly, and pay 4,000 yuan a month."

How much is the monthly salary? Director Zhang was shocked by this number. Old Lu knew the Han family well and sighed: "It's still four thousand, not too much, it's not a problem for your father. It's good to have money at home. You say you don't have to do anything, you have everything."

The topic was too awkward, Han Bo asked with a smile: "Secretary Lu, you haven't returned since you came out?"

"No, it's okay to go back. Go here today, go there tomorrow, have a walk and have a meal at a hundred families. This time the favor is too big."

Thinking of staying in someone else's house tonight, Lao Lu pulled the suitcase and suddenly unzipped the zipper. Mei Fei said, "The first time I came to the door, you can't be empty, otherwise it will be laughed at by Xiaolei's parents. Borrow flowers to offer Buddha, don't be polite, the same bag."

A box of local specialties from all over the country was given to him by everyone, and I guess it was also in that box.

You don't have to be polite to him, he will be unhappy if you are polite.

He quickly took it down and helped him pull the box and put it in. Han Bo asked again: "Director Zhang, tomorrow Mid-Autumn Festival, why do you choose this time to go back to visit relatives? Why don't you get early or just wait for the New Year?"

"It's not like visiting relatives if you don't go back to celebrate the Mid-Autumn Festival, but your nephew gets married and you'll have a wedding banquet."

Director Zhang smiled and added: "My father only has two sons, my brother and I. My family is a daughter, and my elder brother gave birth to a son, that is, my nephew. My old father loved his grandson very much and passed on the family line. He could not stop the incense. If marriage is such a big deal, I, the uncle, must go back."

Old Lu picked up a frame on the decorative frame and smiled and said, "It was Director Zhang who went back, not Director Zhang who went back. I have been out for so long and missed a little homesick. It just so happened that the new house was turned on."

I actually played for five months!

Han Bo was completely convinced. Just when he didn't know whether he should compliment, Lao Lu pointed to the photo and asked, "Xiao Han, where did he take pictures with Xiaolei, so many people?"

"The capital has celebrated the return of Hong Kong, the cultural evening party, and the filmed during the performance."

"Did you attend that conference?"

"Um."

"My good friend, I watched it on TV, and the General Secretary attended. Have you seen Political Commissar Gu? Political Commissar Gu also went that day. He happened to study at the National Defense University and happened to attend the celebration."

You think it was Liangzhuang's conference, and you think the Workers' Stadium was Liangzhuang's old cinema.

Han Bo was ridiculous by this question, and suppressed his laughter and explained: "There are tens of thousands of people in the venue. Political Commissar Gu is the leader. He must be sitting in front and should not be far from the General Secretary. We belong to all walks of life in the capital. We sit in the third stage and step down. From far away, we can only see the General Secretary alone, just like watching TV at home, watching the big screen."

“It’s no wonder there are so many people.”

How can the cadres promoted by themselves not ask about the current situation?

When he asked about his recent situation, Han Bo briefly introduced it. Before, he only knew that the young man had been transferred to BJ. Unexpectedly, he came to school. Old Lu pondered: "It doesn't matter whether the municipal bureau will release people. I have inquired about it. After getting married and starting a family with BJ for more than ten years, as long as you have a house in BJ, you can move your household registration. If you don't move your household registration now, you can still move in the future."

"I really didn't think about this, and I really want to go back."

"It's good to go back."

Who doesn’t say that their hometown is good, and that bj is not as good as you imagine.

The air is bad and the climate is bad. It looks good within the Second Ring Road, and the third Ring Road is a vegetable field. The rural area of ​​BJ is far worse than that of Liangzhuang, and even worse than that of Jiangnan.

Lao Lu was concerned about his work and his studies. He flipped through a lot of books on the dining table and desk, and became more confused as he read it.

"Chemistry, Botany, Zoology, Microbiology, Biochemistry, Cell Biology, Modern Genetics, Modern Molecular Biology, Biochemical Engineering, Genomics and Bioinformatics, Proteomics... Xiao Han, what are you learning, are you planning to change your career?"

"I am preparing to take the postgraduate entrance examination for biochemistry and molecular biology, and I have no plans to change my career."

Lao Lu put down the book and asked: "Biochemistry, molecular biology, what major is this?

He was not the first to ask, and probably wouldn't be the last one. For most people, this major is relatively remote. Han Bo had to patiently explain: "This major mainly studies biological phenomena from the perspective of microscopic, that is, molecular. It explores the essence of life at the molecular level, studies the molecular structure and function of organisms, material metabolism and regulation, and belongs to the basic research major."

I said a lot, but didn't understand a single sentence.

Lao Lu asked: "What's the use of learning? What can you do after graduation?"

"This, how to say, this major requires students to learn and master the basic theories and basic knowledge of biochemistry and molecular biology, as well as biological science and microbiology science, and be trained in relevant professional skills, so as to have the professional skills required for scientific research and applied research.

As for what you can do after graduation, you mainly go to scientific research institutions and universities to engage in scientific research, teaching, or engage in application research related to biotechnology in industries such as industry, medicine, food, agriculture, forestry, animal husbandry, fishery, environmental protection, gardening, etc.... It is similar to physics, and it is very important. What is the use of is hard to explain for a while."

"It's useless if you can't explain it clearly. Xiao Han, you police, why are you learning this?"

“It’s useful, it’s very useful.”

There is no way, only for example. Han Bo smiled and said, "Secretary Lu, Holmes, you must have heard of, Detective, why is one of the murderers? The mud on your shoes is only somewhere, and the inconspicuous small spot on your clothes is pollen, and only somewhere, you went to the murder scene, but lied that you didn't go, and you definitely killed the person.

There are always such plots. When reading novels, it feels amazing. It feels like this character is amazing. It is indeed amazing and knowledgeable. But it is a novel after all, and it is a novel from many years ago. In court, the judge would not or dare not accept such evidence. Why do you say that the mud comes from the same place and why do you determine that the pollen comes from the same place?

If I encounter such a situation, I can use the knowledge I am learning, do experiments, and use scientific means to analyze whether the mud on the suspect's feet and the mud on the crime scene have the same flying, as does the pollen."

The two of them looked at each other, but they didn't seem to have completely digested it.

Han Bo continued: "For me, biochemistry and molecular biology are just the foundation. What I really want to study is forensic science, a marginal discipline that intersects natural science and law. For example, forensic physical evidence identification requires the use of theories and methods of disciplines such as immunology, biology, biochemistry, and molecular biology.

The species, species and individual sources of biological survey materials should be identified using the polymorphisms of the genetic marker system. These include individual identification, paternity test, gender identification, race and genus identification, etc., which involve DNA comparison technology.

For example, forensic toxic substance identification is also inseparable from chemical means; for example, for trace physical evidence identification, not only requires physics, but also chemical and instrumental analysis methods to qualitatively and quantitatively analyze the composition and structure of relevant materials, and identify the types of samples, the sameness and identity of the samples and the suspected samples."

"It's really useful to say that!"

“Very useful.”

Han Bo smiled and continued: "Edmund Roca, the father of forensics, established a golden law: "When two objects come into contact, they will cause transfer. They will take away something and leave something behind. This is also the cornerstone of modern criminal forensic science.

Let me give you another example. The murderer shot and killed someone, threw the gun after committing the crime, and made up absenteeism. What should I do if I encounter this situation? There is a way, because during the shooting process, the striker hits the bullet, causing the gunpowder to burn quickly, which will form a high-pressure gas in the barrel of the gun.

While pushing the warhead out of the muzzle, this gas also sprays out unburned gunpowder particles, gun oil, metal chips, soot and other residues from the muzzle at high speed. When firing within a certain distance and range, these particulate matter will be left on the target object or obstacle and the suspect's hands, which is what foreign colleagues call "shooting residue".

Like ballistics, fingerprints and DNA, guns are different, and the residues are also different. The distribution characteristics of guns and guns are completely different. We only need to collect, identify and compare relevant evidence such as the suspect's hands, clothes, or gloves to know whether he has fired a gun and what kind of gun he is using."
Chapter completed!