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The moment the bomb exploded, the four special case team members and the bomb disposal expert thought to themselves: Oops, my life is gone now.

A flash of fire and thick smoke rose. Although the bomb exploded, it was very powerful and thudded like a big firecracker. Except for the bomb disposal expert's hand, no death was caused. Even so, the four members of the special case team were still in a cold sweat. The police from the outside rushed in after hearing the sound and rushed to the stretcher with a hurry to lift the injured and screaming bomb disposal expert onto the stretcher.

There was a false alarm, and paper confetti in the air was flying, filled with a scent of sulfur.

Hualong said: What's going on? What's this?

Professor Liang: This should be a warning from the murderer!

The police chief: A comprehensive inspection of the student dormitory and laboratories of ammunition engineering majors should be conducted.

Bao Zhan: The person who can make bombs will not have a low IQ so that we can find the explosives hidden under the bed.

Su Mei: I was so scared, what are we going to do next?

Professor Liang: Picking up trash.

The special case team immediately took action at the explosion site. They had to find all the debris of the bomb, and then pieced together the fragments to find clues left by the murderer. If there are no witnesses or surveillance videos, it is very difficult to solve the explosion. Because after the explosion, the evidence will be destroyed with the explosion, and the rescue measures of fire brigades and medical staff will also destroy the scene.

After the on-site inspection, Su Mei used computer animation to restore the entire explosion process. An instructor in ammunition engineering explained in detail the manufacturing technology of this moonlight bomb. The moonlight bomb must be manufactured at night, and the tools used are also very simple. An ordinary thermometer is used as the detonation device. After the bomb is placed, the mercury gradually reaches the detonation point as the temperature of the surrounding environment rises. The murderer did not place much explosives, which is also the reason why the bomb is not powerful. Professor Liang analyzed that this was the murderer's intentional purpose, not to kill people but to deter the police.

This bomb is a warning. The murderer told the special case team in this way that he could blow them to death, hoping that the police would retreat if they were in trouble.

Su Mei said: The next explosion will probably escalate.

Hualong said: Obviously, we must go on the table and will not retreat. Who said we are the special case team?

The explosives were placed in a carton box, which was a sanitary napkin packaging box. Baozhan picked up a piece of carton fragment with tweezers, and put his nose close to smell it. He raised his face and closed his eyes and said: In addition to the smell of gunpowder and sulfur, there is also a fragrance.

Professor Liang said: "I don't believe your nose, but this carton is crucial to us. I will immediately perform separation tests and smoke reaction experiments.

The smoke reaction is an identification of explosion or shooting residues made by the police during the detection.

In the Hong Kong "April 22" case of robbing the armored car, the police confirmed that there were shooting residues on the sleeve of a piece of clothing through gunpowder reaction, thus finding the owner of the clothing, the real murderer of the robbery. In the assassination of President Kennedy in the United States, a bullet with the arms serial number C2788 became physical evidence. In addition to fingerprints, gunpowder residues are also key evidence to lock the murderer.

Baozhan first sprayed some organic solvents on the filter paper, such as ethanol, acetone, carbon tetrachloride, etc., and then covered the filter paper on the carton fragments for extraction, then separated gunpowder particles, metal powder, and combustion products. The rest were the residue on the hand. As long as the murderer touched the carton, the police could find clues through scientific and technological means.

Baozhan uses physical inspection method, and the advantage of this inspection is that it does not destroy physical evidence.

However, Bao Zhan tried atomic absorption spectroscopy and fluorescence analysis test one after another, but he did not find the residue on his hands on the carton fragments. However, he was sure that he smelled the fragrance, so it should be left by the murderer.

Bao Zhan used an electron microscope to observe and found no traces of cosmetics left. This result disappointed him and was puzzled. Where did the fragrance come from?

Bao Zhan tried for the last time, he used the middle molecule activation analysis method and finally confirmed that the fragrance originated from a perfume.

Su Mei said: Is it a woman who created and placed the bomb?

Professor Liang: In short, the person who placed the bomb has perfume on his hands. Whether it is a man or a woman, when the murderer put down the cardboard box, the perfume on his hands remains on the cardboard box. In this world, as long as the crime is committed, traces will be left. The location of matter in the whole world is always changing, and there are traces of astral explosions hundreds of millions of years ago, not to mention the bomb we witnessed with our own eyes.

Su Mei said: This cardboard box is also a bit perverted. Who would buy a box of sanitary napkins?

Hualong said: There are also sources of explosives, which are the key points of our next detection.

Although there is only such a little evidence, the case has a glimmer of hope, and everyone vaguely feels that the murderer may be a woman.

Professor Liang arranged work, and everyone took action without stopping. The police officer conducted a lot of investigation, hoping to find witnesses. The police visited the dormitory directors of each dormitory to investigate who had seen the cardboard box and the person holding the cardboard box on the night of the moonlight bomb. Professor Liang specifically asked the police officer to pay attention to finding the source of perfume. The school beauty's dormitory and Lao Ge's dormitory were the key targets for investigation, and perfume was found in both dormitories. The dormitory boss was also included in the police's suspicious sight. He left the dormitory on the night of the incident, and he claimed to the police that he had played Warcraft overnight in the Internet cafe outside the school.

Professor Liang asked Su Mei to verify the words of the boss in the dormitory, and at the same time, Bao Zhan analyzed and compared the perfumes in the two dormitories with the perfumes on the bomb carton. The identification conclusion was made.

Fruits take time. Under certain conditions, the fragrance of high-end perfume should be maintained at least 70 hours, and the fragrance of florals should be maintained at least 60 hours. Most students use inferior perfumes, which can also be maintained at twenty-four hours. Therefore, there is not much time left for Baozhang. It won’t take long to take the clue obtained by the police to disappear into the air.

The investigator who secretly monitored the old goose reported that on the night of the explosion, the old goose had been sleeping in the dormitory. The next morning, this guy who had always been lazy and ungrateful did a lot of things. He cut his hair, got a new hairstyle, sprayed the dormitory boss's perfume, changed into new clothes, and took a shower for the first time. The classmates reported that the old goose had no habit of taking a bath, and the old goose's reason was to maintain the original taste and the true nature of a man.

Apart from these details of life, one thing is strange. The investigator said that the old goose bought a lot of candles, and there were dozens of them, and they didn't know what to do.

The special case team asked investigators to be vigilant and continue to monitor. Candles are likely to be used to create bombs.

At night, these candles come in handy.

The old goose used dozens of candles to put a heart pattern under the school belle's dormitory building. Many students stopped to watch. Many windows in the girls' dormitory building were opened, and some curious girls poked their heads to watch the excitement. The investigator reported to the special case team, and the four of the special case team rushed immediately. Professor Liang asked the dragon to prepare the net gun. Once the old goose had extreme behavior, they would be arrested immediately.

Lao Ge looked willing to take it out. He pointed at the four members of the special case team and said: Look, the notes are coming, cheering me up.

The onlookers burst into laughter, and the four of them in the special case team were expressionless, looking at what the old goose would do next.

The old goose lit the candle with a lighter, and a heart was burning in the night.

This romantic courtship is not uncommon on campus. In order to express love, college students are very creative.

The old goose held his mouth with his hands and shouted the name of the school beauty. The window of the school beauty's dormitory was never opened. He was tired and squatted on the ground and began to shout "I love you" one after another. When he shouted, his body had to stand up, which looked very funny.

Everyone started to make excuses, and some girls took out their phones to take pictures at the old goose.

The old goose shouted loudly: I love you.

The school beauty was so annoyed that she opened the window and said: I was so annoyed.

The old goose said: You come down, please, look, so many people are waiting for you.

The school beauty said: If you have the ability, you take off your bare body and run around naked, and I will go down.

The onlookers laughed and began to cheer and applaud. The old goose stood up suddenly, took off her coat, and threw it on the ground with force. He gritted his teeth and said: Take it off, run naked, run naked, I will fight for love.

The applause around was even more intense, and the students present encouraged the old goose to run naked.

Su Mei said to Hualong and Bao Zhan: I really missed my college days, why didn’t anyone run naked for me at that time?

Hualong said: Yes, otherwise you would have been married long ago.

Bao Zhan said: Lao Ge is very brave. I can’t do such a thing even if I kill you.

The old goose took off their clothes one by one, and in the end they were only a pair of underwear, which was bulging in the underwear. It seemed that this perverted guy had another piece of sanitary napkin today. The weather was very cold, and the old goose was so cold that he hugged his arms and shivered. He said to himself, "Run, run away, it's not cold after running around for a while." The old goose started running naked, and everyone applauded to cheer him up. He ran around the campus and stopped panting, his shoes fell off and a white thing was thrown out of the shoes.

The old goose put on their shoes, a classmate looked down and said with a wicked smile: Lao Goose, your sanitary napkin has fallen off.

Hualong said: I, Lao Ge's grandson actually uses sanitary napkins as insoles.

The old goose closed her mouth and began to shout the school beauty's name at the top of her lungs: I love you, I ran naked, I'm not cold, it's very hot.

Amid the girl's screams, the school beauty appeared. She went downstairs to the old goose. The old goose was so moved that she was about to cry. He opened his arms and waited for the school beauty to pounce on his arms. The old goose's mind showed romantic scenes in Korean dramas or romance dramas. The lovers hugged each other, and the heart made of a candle was burning.

The school beauty did not hug the old goose. She frowned and smiled and stretched out her hand. The old goose was stunned for a moment, and then grabbed the school beauty's hand.

The old goose said excitedly: I love you, for you, I am willing to do anything, marry me.

The school belle said with a face: How much is love worth?

The old goose said: Priceless.

The school beauty sneered and pulled out her hand and said: Bastard, see this real world clearly. Without money, it is hard to move forward. Love in college is just a game and a dream. Once you graduate, break up and wake up. Instead of sitting in the back of your bicycle and laughing, I might as well sit in a BMW and cry. When will you fall in love with you when you are on the Hurun Rich List? I only love rich people. These candles and cheap gadgets want to impress me. It’s ridiculous that you don’t even have a diamond ring, so you dare to propose to me. You are really insulting me. When will you put a heart pattern in a BMW?

The school beauty kicked down a few candles and left coldly, leaving the old goose blankly looking at her back.

Lao Ge returned to the dormitory and slept with his head covered. The investigator reported that Lao Ge had been depressed and depressed for several days. It seemed that the school beauty's words had a big blow to him, but the guy quickly cheered up again and worked hard to win the scholarship.

He sighed and said to the dormitory boss: I'm blamed me, not others for rejection, I don't even have a ring.

The boss of the dormitory said: Brother, you can’t afford a diamond ring, so you might as well buy a bottle of aphrodisiac potion and put it in when you invite her to dinner. You can invite me to have spicy fish in the evening, and I can invite the school beauty to the banquet together.

Lao Ge: I can make spicy fish myself. Let’s make it in the dormitory. The key to this dish is to make it hot.

Door boss: I understand, stir-fry the scallion, sliced ​​ginger, and fry the hot sauce.

Lao Ge: When stir-frying, move quickly, and brush it, and it will be lightning-proof.

The boss of the dormitory: Do you want to add some vinegar to taste better?

Lao Goose: No, what does it taste like? In the end, it’s still MSG.

Door boss: Have you finished pulling it? I didn’t bring any paper.

Lao Ge: My God! I didn’t bring any paper, but I have two sanitary napkins here.

The special case team learned that many students are fighting for scholarships. The female principal introduced that the scholarship is used to inspire students to develop in an all-round way, create a positive academic atmosphere, and reward and fund students with good character and academic performance. At present, scholarships for students majoring in ammunition engineering and explosion technology are being reviewed.

The special case team decided to use the scholarship as a disguised reward to fish the murderer out of the water.

The lecturer said: Many students are limited to theory, including me, who lack practice. I think there are many students who can make moonlight bombs or sanitary napkin bombs, but there should be few people who can create both bombs. Students who use scholarships as bait to make moonlight bombs and sanitary napkin bombs are most likely the murderer.

Hualong: I think the key point of this sanitary napkin case is not the sanitary napkin...

Su Mei: Can you stop talking so rudely? This is an explosion.

Bao Zhan said: The source of explosives is very important.

The female principal and lecturer told the special case team that there is only a small amount of explosives in the school for scientific research and experiments and stored in the laboratory on the second floor of the underground. The special case team checked the laboratory. The underground building was in a straight-through form, consisting of a guideway, main room, sub-room and exhaust vent. Each underground laboratory has two entrances and exits, and the doors are opened outwards.

There are two laboratories related to blasting in the school, one is the explosion science and technology laboratory, and the other is the mechanical and electrical engineering and control laboratory. In addition, there is also a Selenium Mountain experimental area outside the school, where experiments related to explosions are usually carried out there. The Selenium Mountain experimental area has two hydrogen cannons, an underwater explosion laboratory and various explosion testing equipment.

At the case press conference, the special case team analyzed that the murderer should be a student majoring in ammunition engineering and explosion technology. He may have stolen part of the explosives during the experiment, and the bomb may have been made in the laboratory. The murderer has the habit of spraying perfume, and with the sanitary napkin carton, the murderer may be a woman and can enter and exit the laboratory and the dormitory of the deceased counselor.

Bao Zhan noticed that the female principal also sprayed perfume. He secretly investigated and learned that the female principal and the deceased counselor had conflicts over issues such as school spirit management standards. The counselor privately said that the principal was suspected of taking bribes, but Bao Zhan did not find any evidence of taking bribes.

The female principal is respected, honest and selfless, and has a reputation in school. She has never married for her life because of taking care of her cousin who suffers from amnesia.

The school promises students majoring in ammunition engineering and explosion technology that as long as someone can make sanitary napkin bombs and moonlight bombs, even if it is limited to feasible theories, the school will award scholarships.

The police sometimes tempt the murderer during the investigation. For example, in the Everest Family Massacre, the police offered a reward for arrest. A whistleblower said that the deceased was strangled to death by a wire. Only the police and the murderer knew the details of the crime, so it was determined that the whistleblower was the murderer.

A few days later, the police screened out four suspects based on the theoretical reports submitted by the students: Lao Ge, the school beauties, the dormitory boss, and a disabled girl.

The theoretical reports of these four students are feasible. According to their professional theories, they can all create sanitary napkin bombs and moonlight bombs.

School beauty wrote in her paper: Spontaneous combustion of sanitary napkins is actually very simple. There are many substances burning when they encounter water, such as potassium, calcium, rubidium, and cesium. Place aluminum iodine powder in sanitary napkins and add a combustion aid to the blood. When a person has menstruation, the sanitary napkins will burn. If further upgrades the manufacturing, the sanitary napkins can be detonated by burning.

Lao Ge and the dormitory boss' report are exactly the same. The police suspected that they copied each other in order to win scholarships. According to the theoretical knowledge in their report, they could make a moonlight bomb.

The disabled girl was named Xu Nian, and she was the only student who submitted two types of bomb manufacturing techniques.

Xu Nian lost her legs in a car accident when she was young and relied on a wheelchair for transportation. There were many disabled students in college, but it was rare to see them in wheelchairs. Many students knew Xu Nian, and everyone's impression of her was: simple, innocent, versatile, and good at painting and music.

Xu Nian's dormitory chief reported to the police that once, the teacher took the students from the school painting club to sketch and painted a horse on a hillside. That season was the estrus of the horse. A long and thick thing erected under the horse's crotch. All the girls who were painting passed the horse's stick and deliberately did not draw it. Only Xu Nian drew the whole horse intact, and the thing was also vividly drawn. When the teacher checked, other students accused Xu Nian and said: You little girl is so erotic.

The special case team analyzed that Xu Nian is very suspicious!

The female principal denied this view and told the special case team: If we want to investigate who is not suspected of committing the crime in this school, then it must be Xu Nian. How could this innocent girl kill someone? Besides, the counselor lives on the third floor, and Xu Nian cannot go to the counselor's dormitory in a wheelchair, let alone the sanitary napkin placed in the bedside table by the counselor.
Chapter completed!