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The freshmen who had just entered the police academy were elated and couldn't wait to change into police uniforms, and the four-year police academy life began.

Police is a profession that requires dedication and sacrifice, and the cadet police are not formal police officers, so they don't need to dedicate themselves for the time being, but the "sacrifice" has begun from this moment. College life is completely different from that of ordinary college students, not so free, let alone having a vigorous relationship.

No squads, divisional teams, squadrons, brigades, militarized management.

The clothes are the same, the sheets and bedding are the same, and the hairstyle is the same. Boys cannot have more than one finger on their heads. Girls have short ear-length hair, no eyebrows in front and no collar in the back.

The first pass of entering the school is a 42-day military training, and before dawn in the morning, I was awakened by the wake-up whistle and began a day of "devil training". Running drills, pulling exercises, walking queues, standing in a military posture, kicking the right step......

At the end of the day, many of the freshmen were covered in sweat.

The happiest thing they were to do every day was that the instructor announced the "disbandment" and rushed to the canteen at the speed of a 100-meter sprint, completely ignoring the requirement of "two people in a row and three people in a column". The freshmen who usually don't eat much are now eating amazingly large, and their stomachs are simply bottomless, not the fullest, only fuller.

They are always looking forward to the rain so that they don't have to train.

However, if you don't train, you can't be idle, and you have to tidy up your housework. Folding quilts is a compulsory course, and you must fold the quilts into "tofu blocks".

When it rains, the dormitory and the corridor are full of people stepping on the quilt. First spread out the thin, then press, and then use a ruler to mark the quilt to strive for accuracy. After stacking, pinch a little bit to make it beautiful. After a set of steps, everyone was sweating profusely.

It is said that a freshman was lazy and poured water on the quilt, but was severely cleaned up by the instructor, and it is estimated that no one dares to follow suit.

The most painful part was the emergency assembly in the middle of the night.

In the middle of the night in early autumn, with a hint of coolness, the emergency assembly whistle suddenly sounded, one by one hurriedly dressed, scrambling to rush out, often you wear my clothes, I wear your pants......

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

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

With a few classes a week, the law major at OUHK is different from that of natural science, and there is no need to do all kinds of experiments, and the study and work of OUHK graduate students and instructors are very easy, and they don't even have to come to school every day.

Preparing for the unified examination wholeheartedly, I was tired of reading books on biochemistry and molecular biology, and read the monographs of professors, associate professors and lecturers of the Department of Economic Investigation, including tutors. In the evening, I called Cheng Wenming, a "lonely hero" who was far away in the countryside of Haigang City to investigate the 4.19 case, to learn about the progress of the investigation and his location.

Except for the 4.19 case, he didn't listen to anything outside the window, and only read two professional books. I did this every day for more than two weeks, and I gradually got used to this kind of work and rest arrangement.

However, this peaceful life was soon shattered.

Tomorrow for the Mid-Autumn Festival, I will take the moon cakes home, and the old Lu, who has just left the school gate and disappeared for a few months, will reappear in BJ. I called and said that I had just gotten off the train, and asked if I was at work or at home, and I wanted to pay back the ticket money for the last time I came to the capital.

The ticket money is a trivial matter, and it is a big thing for others to arrive at BJ, which must be received, and it must be received well, otherwise people will be scolded behind their backs when they return to Liangzhuang.

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 let the driver go directly to Furui Apartment.

I couldn't let him wait, I didn't take the bus, I took a taxi quickly, rushed to the downstairs of the community and waited for more than ten minutes, and he really arrived, and brought a military officer who went out from Liangzhuang.

"Xiao Han, don't Zhang Luo, we've eaten. ”

The outfit is still very casual and sporty, and the point-and-shoot camera is still hanging on the chest. I came here in April with only one backpack, but now I have two more suitcases, which is quite heavy when I move it down from the car.

Sending the driver away, he curiously observed the living environment of the "old subordinates" in the capital, and emphasized: "I have really eaten, before getting on the train, Director Zhang's lover prepared a lot of cooked dishes, which cannot be wasted, we will eat and drink all the way until we get off the train." ”

When Liangzhuang Township was upgraded to Liangzhuang Township, Director Zhang of the Political Department of a certain unit of the People's Liberation Army not only went back, but also visited the Liangzhuang Police Station.

Director Zhang dragged the trolley box and said with a smile: "Xiao Han, Secretary Lu is not joking, if you are not hungry, you are not hungry, if you are hungry, can we be polite to you here?"

"Then go upstairs to rest and have supper at night. ”

In a fifteen-story high-rise building, Lao Lu felt a little exaggerated, and couldn't help asking, "Xiao Han, do you live here?"

"Well, on the twelfth floor, I just called Xiaolei, and I was so happy to hear that you were here. She is on her way back, you and Director Zhang are not allowed to go to the Beijing Office, stay at my house at night, there is a vacant room, you will know when you go up. ”

"This girl, so polite. Lao Lu smiled proudly, took the cigarette and asked, "Where does your father-in-law live?"

"The front alley, not far from here, ten minutes walk. ”

"Close. ”

"I bought this place because it's close, let's go, go upstairs first, it's not a place to talk outside. ”

He didn't live with his father-in-law and mother-in-law, and Lao Lu had no scruples, so he was no longer polite, and happily agreed. If he doesn't go, Director Zhang will naturally not go, say a few kind words, walk into the community together, and take the elevator to the twelfth floor.

Lao Lu put down his backpack, opened all three rooms to see, returned to the living room and said with a smile: "Stand high and see far, a commercial house with an elevator." Xiao Han, how much is this house, it is estimated to be 200,000. ”

Han Bo took out two cans of drinks from the refrigerator, found a small plate from the kitchen and used it as an ashtray for him, and said with an embarrassed face: "BJ house prices are expensive, 200,000 yuan is not enough." Including the parking spaces downstairs, more than 700,000, the decoration is not counted. ”

"More than 700,000!"

"If you take out a loan, pay more than 100,000 yuan first, and repay the rest slowly, 4,000 a month. ”

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

This topic was too embarrassing, and Han Bo asked with a smile: "Secretary Lu, you haven't been back since you came out?"

"No, it's okay to go back. Go here today, go there tomorrow, take a walk, eat a hundred family meals, this time the favor is great. ”

Thinking that he was going to live in someone else's house tonight, Lao Lu pulled the suitcase with his hand, opened the zipper suddenly, and said: "The first time you come to the door, you can't be empty-handed, otherwise it will be spread out and Xiaolei's parents will laugh." Borrow flowers to offer Buddha, you're welcome, the same bag. ”

A box full of local souvenirs from all over the world, given to him by the whole family, is estimated to be in that box.

There is no need to be polite to him, he will be unhappy if he is polite.

Quickly put it away and helped him pull up the box and put it away, Han Bo asked again: "Director Zhang, tomorrow for the Mid-Autumn Festival, why do you choose this time to go back to visit relatives, why don't you go early, or simply wait for the New Year." ”

"It's not going back to the Mid-Autumn Festival, it's not a family visit, my nephew gets married, and I go back to drink wine. ”

Director Zhang smiled and added: "My father has two sons, my brother and me, my family is a daughter, and my eldest brother gave birth to a son, that is, my nephew. My old father loves his grandson very much, he inherits the lineage, he can't cut off the incense, and getting married is such a big event, I can't help but go back as an uncle. ”

Lao Lu picked up a frame on the decorative shelf and said with a smile: "I went back with Director Zhang, not Director Zhang with me." Coming out for so long, a little homesick, just as the new house was handed over immediately. ”

Actually played for five months!

Han Bo was completely convinced, and just as he didn't know whether to compliment or not, Lao Lu pointed to the photo and asked, "Xiao Han, where did you take this with Xiaolei, so many people?"

"All walks of life in the capital celebrate the return of Hong Kong, the theatrical evening, and the performance. ”

"Did you attend that convention?"

"Hmm. ”

"My goodness, I watched it on TV, and the General Secretary was in attendance. Have you seen Political Commissar Gu, who also went that day, and he happened to be studying at the National Defense University and happened to attend the celebration meeting. ”

You think it's a meeting in Liangzhuang, and you think that the Workers' Stadium is an old cinema in Liangzhuang.

Han Bo was made laughed by this question, and forced a smile to explain: "There are tens of thousands of people in the venue, and Political Commissar Gu is the leader, so he must be sitting in the front, and he should not be far from the general secretary." We belong to the masses from all walks of life in the capital, sitting on the 3rd stage and getting off the stage, far away, we can only see the figure of the general secretary, and the program is the same. It's like watching TV at home, watching the big screen. ”

"It's no wonder there are so many people. ”

How can a cadre who has been promoted by himself not ask about the current situation?

He asked about the recent situation, Han Bo briefly introduced, before I only knew that the young man was transferred to BJ, but I didn't expect to come to school, Lao Lu muttered: "It doesn't matter if the city bureau releases people or not, I have inquired, I have been married to BJ girls and started a family for more than ten years, as long as there is a house in BJ, you can move your household registration over." If you don't move your hukou now, you can move in the future. ”

"I didn't really think about it, and I did want to go back. ”

"It's good to go back. ”

Who doesn't say that their hometown is good, and BJ is not as good as they imagined.

The air is not good, the climate is not good, it looks good within the second ring, a vegetable field in the third ring, BJ rural area is far worse than Liangzhuang, and it is not as good as Jiangnan.

Lao Lu cared about his work and his studies, and flipped through a large pile of books on the dining table and desk, and the more he read, the more confused he became.

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

"I'm preparing for a master's degree in biochemistry and molecular biology, and I don't plan to change careers. ”

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

He was not the first to ask, and it is estimated that it will not be the last, for most people, this major is relatively secluded, Han Bo had to patiently explain: "This major is mainly to study biological phenomena from the perspective of microscopic, that is, molecular. It is a basic research major to explore the nature of life at the molecular level, study the molecular structure and function of organisms, and the metabolism and regulation of substances. ”

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

Lao Lu asked: "What's the use of studying, what can I do after graduation?"

"This, 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 sciences and microbial sciences, and receive relevant professional skills training, so as to have the professional skills required for scientific research and applied research.

As for what graduates can do, they will mainly engage in scientific research and teaching in scientific research institutions and colleges and universities, or engage in applied research related to biotechnology in industry, medicine, food, agriculture, forestry, animal husbandry, fishery, environmental protection, gardening and other industries...... It's similar to physics, it's very important, and I can't tell what it's used for a while. ”

"It's useless if you can't tell, Xiao Han, you are a public security, what are you doing with this?"

"Useful, very useful. ”

There is no way, it can only be an analogy, Han Bo smiled and said: "Secretary Lu, Sherlock Holmes, you must have heard of it, detective, why do you say that a person is a murderer, the mud on your shoes is only somewhere, and this inconspicuous little spot on your clothes is pollen, which is also only found somewhere, you go to the scene of the murder, but lie that you didn't go, the person is definitely killed by you."

There is always such a plot, and when I read the novel, I feel amazing, and I feel that this character is very powerful. It's amazing, it's very knowledgeable, but it's a novel after all, and it's a novel from many years ago. In court, judges will not or dare not accept such evidence, how can you say that the mud came from the same place, and on what basis can you be sure that the pollen came from the same place?

If this happens, I can use the knowledge I am learning to do experiments and scientifically analyze whether the mud on the suspect's feet is the same as the mud at the crime scene, and the same is true for pollen. ”

The two looked at each other, and it seemed that they had not fully digested it.

Han Bo continued: "For me, biochemistry and molecular biology are just basics, and what I really want to study is forensic science, a marginal discipline at the intersection of natural sciences and law. For example, forensic evidence identification should use the theories and methods of immunology, biology, biochemistry, molecular biology and other disciplines.

The polymorphisms of the genetic marker system should be used to identify the species, species and individual origin of biological samples. These include individual identification, paternity testing, gender identification, race and species identification, etc., which involve DNA comparison technology.

For example, forensic poison identification is also inseparable from chemical means; for example, the identification of trace physical evidence requires not only physics, but also chemical and instrumental analysis methods, through qualitative and quantitative analysis of the composition and structure of relevant substances and materials, to identify the types of samples, the similarity and identity of the samples and the suspected samples. ”

"That's a big deal!"

"Very useful. ”

Han Bo smiled and continued, "The 'Father of Forensics' Edmund Rocca established a set of golden laws: 'When two objects come into contact, there will be a phenomenon of transfer. It will take away some things, and some things will be left behind'. And this is the cornerstone of modern forensic science.

Let's give you another analogy, the murderer shoots and kills, and after committing the crime, he loses the gun, there are no witnesses, and he fabricates an alibi. What to do in this case, there is a way, because during the firing, the firing pin hits the bullet, causing the gunpowder to burn rapidly, which will form a high-pressure gas in the chamber of the gun.

This gas pushes the bullet out of the muzzle, and then sprays unburned gunpowder particles, gun oil, metal shavings, soot and other residues from the muzzle at high speed. When shooting at a certain distance and range, these particulate materials will be left on the target or obstacle and on the suspect's hands, which is what foreign counterparts call 'shooting residue'.

As with ballistics, fingerprints, and DNA, different guns have different residues, and the distribution characteristics of shooting residues are completely different from guns to guns. We only need to collect, identify and compare the suspect's hands, clothes or gloves and other relevant evidence to know whether he has fired a gun and what kind of firearm he used. ”

Director Zhang had heard of the famous Chinese American detective, and suddenly reacted, and couldn't help laughing: "Secretary Lu, I understand, Xiao Han wants to be a detective like Li Changyu, and this knowledge is really useful to him." (To be continued.) )