At 9:00 a.m., after driving to the police station on the weekend to report, I went directly to the warehouse in the 77th block, and when I opened the warehouse door, I found that the only empty space in the warehouse was covered with white paper.

"Adam, before I go, you told me why glowing ammonia makes blood fluorescent?"

"Luminescent ammonia is a synthetic chemical ingredient with a chemical formula of C8H7N3O2, because hemoglobin contains iron, iron can catalyze the decomposition of hydrogen peroxide, so that hydrogen peroxide becomes water and monooxygen, and monooxygen, which oxidizes luminol to make it glow. What do you remember all this for? To fully understand, you have to relearn a lot of things in chemistry, and now you just need to remember when to use luminescent ammonia for forensics, and when to use ALS, and remember the contraindications. ”

When Adam explained all this, he didn't hit the slightest stumbling, as if these things were completely stored in his memory, as if he were his own name, and he would never forget them in his life.

"Zhou, come here."

I closed the door of the warehouse on the weekend, walked over to the white paper in the warehouse, and when I got closer, I realized that there were blood stains on every white paper here.

"You have the basis for bloodstain identification, but I don't know to what extent this foundation has reached, let's test it first, and then start to enter the formal forensic study." Adam pointed back to the white paper behind him and asked, "What kind of blood is this?" ”

The blood stains on the white paper are very simple, consisting of an irregular arc that slides diagonally upward, most of the blood spots in the blood stains are conical dots, and a small part of the blood spots have traces of downward flow from the center of the dots......

"It depends on the blood on this piece of paper."

Adam looked at the weekend with satisfaction, and for the first time he thought that the other party was very professional: "The top position on the wall of the murder scene, I need you to tell me the cause of death of the deceased from the blood alone." ”

"Spilling bloodstains, if this kind of blood stains appear on the wall, it should be that the murderer hit the deceased on the head with a blunt object, and after many blows, the murder weapon was stained with blood, and when the blunt weapon was raised again, the blood that had just adhered to the murder weapon was sprinkled on the wall with force." Zhou Zhou approached the hanging white paper, and carefully analyzed: "This is definitely not the first two blows, if it was the first two blows, there should not be so many blood stains on the murder weapon...... He thought for a while: "It should be that the deceased's head was hit again after the blood stains were struck again to make the murder weapon stained with blood, and when it was thrown out, the blood stains hit the wall......

"Why not a sharp weapon?"

"The location of the blood stains is different, and it is rare for people to cut off their heads when they use sharp weapons to kill people, and if the internal bleeding caused by piercing into the abdominal cavity sticks to the murder weapon, the position thrown out when the murder weapon is pulled out should not be in the position on the wall."

Weekend thought for a moment and suddenly looked up at Adam: "Damn, you misled me!" ”

"When any murderer uses a blunt weapon to hit the opponent's head, he will definitely use his hands in the case of murder, and it is impossible to wave the murder weapon with both hands in the direction of the shoulder, it must be that the murder weapon is raised with both hands and waved over the head, judging from the bloodstains, so much blood can stick to the murder weapon means that the deceased was already in a coma or death state at that time, and there was no ability to fight back at all, so these blood stains should be on the roof of the shed."

Adam smiled, he smiled very innocently, it is very difficult for a forty-year-old man to maintain a simple smile, which shows that his life has not been polluted by any filth in society.

"Your bloodstain skills are very strong, Zhou, but you're not very focused." Adam explained: "I did mislead you, because the question you asked me when I entered the door was about 'glowing ammonia', and your mind didn't turn for a moment, but you didn't see where I was misleading you. ”

Adam stretched out his finger and pointed to the scraped white paper and said: "The blood stains that appear on the wall, in your words, 'spilling blood', even if this is not a scientific name, but it is not important, the important thing is to understand, just like what you learn when you study is not as important as how to learn." Once this kind of blood stain appears on the wall, it means that the murderer is holding the murder weapon in one hand, and he will only wave it in the direction of the same shoulder when he raises his hand when he holds the murder weapon in one hand, and the murder weapon may be an ashtray with enough thickness, some antiques or works of art that can kill people, or a collection of special stones, not necessarily the baseball bat that you associate with after finding this bloodstain. ”

The weekend was shocked, this change of state can even guess the murder weapon in his heart that equipped the murderer in the simulation screen with a baseball bat...... Also, holding an ashtray with both hands or throwing a stone at the head of the deceased should be done by actresses and children who lack strength...... Damn, how many pits are there here?

"When you enter a place like the homicide department and find the same type of blood stains at the murder scene, don't have any preconceived ideas, you must remember that it is the police who analyze the scene and determine the shape of the deceased's wound, and only after the forensic doctor gives you a positive answer and clearly tells you the shape, depth, and surface of the wound, you can match the murder weapon used in the murderer's hand with all the objects you have seen. Otherwise, you can't find the murderer if you can't find the murder weapon. Preconceived ideas can get a murderer away from justice, and it can also put a wronged man in jail. ”

Adam in the warehouse said very seriously: "The attitude of handling the case should be the same as falling in love, from the beginning of sweet words to holding hands, kissing, and having a relationship - the system is gradual, you need to lay the groundwork layer by layer, which can form a net, without this net, any murderer can easily escape, even in court." ”

"You're in a relationship with the scene of the murder?" Weekend felt a little ...... Adam

"What's the problem?"

"Then you must be single, otherwise you can only marry a metamorphosis killer as a wife to satisfy this metamorphosis - sexual fetish, in terms of your profession, the first thought you have when you see this kind ---of murderer is to catch him and send him to court, which means that you will never be able to marry a wife in your life."

"I think well, I have a good logical and observational skills...... Knowledge, reasoning is not rigorous enough. Adam held out his index finger and pointed to the weekend to make a judgment.

Adam pointed to another blank piece of paper: "Tell me, what is this." ”

"Medium-speed splattered blood......"

"Where's this?"

"......" found a lump of yellow and green at the same place where Adam pointed to the white paper, and walked in for a long time before he realized: "This is a boogie!" Do you OCD people like to pick your nose while studying these things? And smeared on paper! ”

"Concentrate!" Adam screamed in embarrassment: "I'm talking about blood, not my private life!" ”

The two men spent more than two hours in the warehouse researching the types of blood that might have been present at the murder scene, and they had to study all the types of common cases, and the morning passed in their discussions.

"Adam, go eat, I'll take you to an authentic Chinese restaurant."

"Okay." When Adam reached for the hanging blank papers, he was going to help over the weekend, but he was also taught all morning: "Don't ...... Don't touch, don't touch anything in the room, if you let me see you touch my things...... At least I'll feel uncomfortable now, but maybe I'll get more familiar with it and get used to it later. I'm sorry, I have OCD, not for you. ”

“OK。” Weekend slowly withdrew: "I'll wait for you in the car." ”

Half an hour later, Adam walked out of the warehouse, and when he got into the car, he was very focused on filling in something on a printed form, and he didn't look up until he got into the car.

"What's that?"

Adam replied after hearing the weekend's question: "Your class schedule starts with understanding the human body, I can't teach you too much about blood, but I can teach you a lot of things like hair, scalp shave, skin tissue, lip lines, palm prints, fingerprints, tooth shape, and bones." ”

"So much? Do I want to learn bones too? ”

Adam shook his head and said, "This is only a part, after the human body is over, you will have to teach microorganisms, fibers, plants, and chemical toxins...... It takes a lot of time to get an idea. He actually made a rare joke after getting acquainted with the weekend: "Anyway, what we have the most is time." ”

Laughed on the weekend, I'm afraid the two of them are the weirdest patrol officers in the whole LA, not to mention the patrol area, one has to be retrained, and the other can't even enter his own jurisdiction.

Suddenly, the weekend knew a little bit about why Preston didn't let Adam into the precinct, if he stuffed this goods into the wandering area, he could find dozens of times more cases every day on the chaotic streets than he did now, and the entire Western Bureau couldn't write a report that the entire Western Bureau had arranged for, then Preston would probably be wiped out because of the super high crime rate that Los Angeles had never had.

"By the way, how was the crime scene at the Cecil Hotel where you took me that day? Did the medical examiner report that the female corpse had been sexually assaulted? ”

"So I want to learn forensics, forensics, everyone knows that the best time to solve a homicide case is 48 hours after the crime, but the manpower problem of the forensic and forensic department is a headache, they are used to seeing corpses and murderers, they would rather spend their time on the babysitter theft case in the celebrity's house, I haven't seen that report for two days, including my colleagues in the homicide department."

When I drove from the 77th block to Chinatown on the weekend, I asked, "When I watched CSI, I thought the forensics department and forensic people were very efficient......

"That's a TV series, and now you have to make an appointment in advance to go to the hospital, do you expect these guys with government salaries to treat every deceased person as a close relative?"

Seeing Adam's inexplicable fire, the weekend began to shift the conversation, and there was no need to bring this conversation into an unpleasant range: "Then under what circumstances am I considered a graduate?" ”

"Graduation? When you can figure out what the fiber belongs to based on the composition of the fiber, or give you a skull, you can recreate the person through 3D simulation, and then I'm afraid there is nothing I can teach you more. ”

As I drove around an intersection over the weekend, I thought to myself, "If this is a game, it's time to upgrade, right?" ”