After a day of training, we chatted.

"Do you know why you've been able to improve so much over the past few months? Even more than you can imagine? Physician Liu asked me.

"It's because of the power of hatred!" I replied aloud.

"That's a big deal...... Gao Yue, do you know? In fact, everyone has a lot of potential energy, but it is easy to be overshadowed by habit, blurred by time, and consumed by inertia. In the past, you had too many things to do, plus inertia, so it was difficult to focus on one thing, but now it's different, your hatred makes you full of fighting spirit and determination, your strong will and resilience become incomparable, and with your focus, you can accomplish so many unimaginable things under very bad conditions...... The ominous premonition I said last time is that in the last few days, they will make some moves, and we will have a life-and-death battle with these wicked people, success or not, in one move!! I think you're almost ready! Dr. Liu's tone was resolute.

"Yes, I feel like I'm almost ready! Ready to go ahead with our plans! I clenched my fists and shouted.

"Yesterday they just brought in dry food and water, and after 14 days, they will come again, and at that time, we will officially implement the escape plan!" Dr. Liu exclaimed.

"Good! That's it, fourteen days later, let's leave this hellish place together!! "I was so excited that I hit the wall with my fist.

After these days of extremely difficult preparation, it is finally about to usher in that most important moment! I think about that moment every day!

"It's time to rest, I'll tell you about the common sense of those detectives, because, the more you know about these things, the better it will be for you!" Physician Liu said.

"Okay...... That's what I love to hear! "My interest is back up.

"First of all, I will tell you about the time of death and the inference of the cause of death, do you know how long after death people usually start to stiffen and stiffen? What are the symptoms of suicide with a gun? What are the types of deaths from poisoning? What are the types of fingerprints and how do I extract them? Physician Liu asked.

"I don't know...... I don't even know...... Tell me about it! Please, my doctor! I shouted.

"Okay...... Typically, a person begins to stiffen within 30 minutes to 2 hours after death, and the whole body stiffens after 9 to 12 hours...... Stiffness will persist for the next 30 hours, then soften, and return to its original state after about 70 hours. Normally, this is true, but if the ambient temperature is higher than 35 degrees, the stiffness and softening will accelerate, and it will only take 24 hours to recover. After strenuous exercise before death, the protein is more likely to solidify in the body, and it will stiffen faster than usual after death. By burying the corpse in the soil so that the body does not come into contact with the air, the corpse will decay at one-eighth the rate of normal decay, and it will be slower in water...... Do you understand? Physician Liu said.

"Oh...... I understand! "I was horrified.

"Speaking of suicide, when a pistol is held against the head, it leaves burn marks around the bullet holes, and the color of the surrounding skin deepens...... The hole that the bullet enters is smaller than the hole that comes out, and the blood flow is a little less, and under normal circumstances, only suicide will leave scorch marks, if not, it can be inferred that he was killed! …… If you have a perforated lung, you will not be able to breathe because your lungs cannot expand and you will not be able to breathe, which will cause suffocation...... He struggles in pain for about 10 to 15 minutes before he dies. The symptoms of drowning are usually a slight water stain in the mouth, dilated pupils, and bleeding on the mucous membrane of the eye, and the eardrum will also rupture due to water pressure, causing bleeding...... "Physician Liu exclaimed.

"Oh......" I stuck out my tongue.

"Let's talk about the symptoms of poisoning again, if you find that someone is poisoned, the lips will definitely be purple or black first, and then this phenomenon will also appear in other parts of the body, the eyes will sometimes stare at each other, the hands will clench into fists, the waist and legs will curl up, etc., Gao Yue, you remember! Also, if the deceased's skin is pink and some spots appear from the inside of the skin, it is obvious that the sodium hydroxide poisoning is fatal, and if the poison is in the capsule, it will take at least 15 minutes to melt for the toxicity to appear...... If it is poisoned on the flower, the flower itself should also wither first...... In addition, on the surface, it appears to be a death of 'suicide' by biting off the tongue, sometimes caused by convulsions caused by inhaling poisonous gases or swallowing poisonous substances...... I encountered this situation many years ago, and at first I thought it was suicide, but after a lot of careful investigation, I found out that it was caused by swallowing poison! Physician Liu said.

"Ahh I see! "I opened my mouth wide.

"The symptoms of carbon dioxide poisoning are: the gas around a person contains more than 20% carbon dioxide, then after inhalation, it will have severe spasms, and in a few seconds, it will bite the tongue and die, and the body will be cold. Carbon dioxide is heavier than air, so it sinks underneath a particular space. The symptoms of strangulation are a deep purple mark on the throat, dilated pupils in pain, and the tongue sometimes sticks out and turns purple-black...... If the deceased's hair is slightly burnt and the body muscles are extremely stiff, this is a characteristic of death due to high voltage, and the scald caused by the electric current flowing from the tip of the finger into the body will make the finger grayish white. He continued.

I didn't say anything, and a lot of images came to mind.

"Gao Yue, let me tell you about fingerprints, this is very important! There are many places where I will use it in the future! Fingerprints can be divided into three categories: the first type is visible lines, which are lines that can be seen visually. For example, if the hand is stained with paint, blood, ink and other items, it is usually printed on the fingerprint card to become the basic information; The second type is molding, which refers to fingerprints found on soft materials, such as candles and clay embossed by hand contact; The third type is latent fingerprints, which are fingerprint lines formed by the transfer of natural secretions such as sweat from the body, which are not easy to find visually, but they are the most common fingerprints at the crime scene! You have to be clear about that! Latent fingerprints are often left by fingers that come into contact with grease, sweat or dust, and then come into contact with a clean surface, although these fingerprints cannot be seen with the naked eye, but after special methods and some special chemical agents are used to deal with them, these latent fingerprints can be revealed. The most common fingerprint that our forensic staff come into contact with is the latent mark. If the fingerprint is left on the surface of non-absorbent items such as metal, plastic, glass, tiles, etc., the inspection method is relatively easy...... Usually, the powder method can be used, selecting a powder with large color contrast, and sprinkling it on the surface of the item to extract a complete fingerprint; Another method is the magnetic powder method, which uses fine iron powder particles and magnets as brushes back and forth to show fingerprints...... If fingerprints are left on the surface of absorbent items such as paper, cards, leather, wood, etc., they must be chemically treated before they can be visible in the laboratory. Commonly used chemical methods are: iodine fumigation - that is, iodine crystals are used to heat to produce vapor, which reacts with the grease of the fingerprint residue, and yellow-brown fingerprints will appear, which must be immediately photographed or chemically fixed; Ninghaidelin method - spraying the reagent on the sample, after reacting with the amino acids of the body's secretions, it will show a purple fingerprint; Silver nitrate method - after the silver nitrate solution reacts with the sodium ammonia in the latent fingerprint, it will produce a black fingerprint in the sun; Fluorescent reagent method – Fluorescent ammonia and phthalodialdehyde can almost immediately react with proteins or amino acids in fingerprint residues to produce highly fluorescent fingerprints, and this reagent can be used on the surface of colored items. Other methods can be used to collect evidence, such as the three-second glue method, which uses the gas of cyanoacrylate to react with water and amino acid molecules to create a fingerprint...... Listen to these professional things first, just know them, you don't have to remember them all, we'll explain them to you in detail after we go out! Physician Liu said.

"Doctor, if we can get out and get revenge, I'm going to be a real private detective! Put everything you learn from you to work! I said out loud.

When Dr. Liu heard this, he was silent.