After everyone initially deduced the motive for killing the hair-washing girl, Xu Tiannan always looked solemn, as if he was thinking about something.
Murong Shui asked: "Boss? Why do you look so worried? Now the murderer died on the scene in an accident, and he was not even brought to justice. Isn't it bad?"
Xu Tiannan shook his head and did not answer, but Murong Shui quickly understood and asked in a low voice: "Are you still worried about the identity of this murderer?"
"No, I also believe that this murderer is the murderer who killed the shampoo girl and Liu Jianren, but..."
Xu Tiannan said, pacing back and forth in the room, as if he was looking for something, and his behavior also made Li Mengxue notice something unusual.
"Brother Nan, have you discovered anything?" Li Mengxue asked in a low voice.
After Xu Tiannan walked around the room, he responded: "Although we can basically confirm that the Shattered King killed the hair-washing girl out of some impromptu intention and without any advance planning, I am now suspicious of something.
More important things."
"whats the matter?"
Xu Tiannan thought: "Although judging from the evidence at the scene, Liu Jianmin and his female secretary, Liu Jianren and the girl who washed her hair, there is enough evidence to prove that the Tattered King is the murderer, but I suspect that the real murderer is someone else.
That is to say... Even though the Rag King has killed people, at best he is just a scapegoat!"
As soon as these words came out, everyone in the room suddenly fell silent. Although no one said anything, everyone's heart felt as if they were being trampled by ten thousand grass and mud horses.
Since the day Liu Jianmin was killed, the police officers of the Criminal Investigation Detachment have gone through an investigation period of more than 2 months. In the end, the murderer was not caught, and the case was sealed as a frozen case.
This incident greatly damaged everyone's morale, and also caused many people's countless sleepless efforts to come to nothing.
And now not only the murderer of Liu Jianmin has emerged, but even the real culprit of the two murders tonight has also emerged instantly. Just as everyone was preparing to hold a celebration banquet after closing the team, Xu Tiannan told everyone, "There is also...
The second murderer".
This conclusion instantly made everyone's mood drop to freezing point.
Of course Li Mengxue knew the importance of this kind of thing, so he whispered: "Brother Nan, this kind of thing is not a joke, are you sure?"
"Are you sure it's useless to say more?"
Xu Tiannan said, then looked at Xu Wudi and asked: "You haven't moved all the things in this scene, right?"
Xu Wudi shook his head, "Master Meng Xue told me not to touch the things inside, so I just used trace fixed lines to draw the outline of the body and the murder weapon. Alas... How could there be someone else who is the real murderer?
people……"
Xu Tiannan did not respond to the other party, but looked at Li Mengxue and said: "Get ready to collect fingerprints in this room."
Li Mengxue said in surprise: "The body of the Tattered King is now at the scene. It can be clearly seen that he committed the crime while wearing gloves. Moreover, Wudi has already taken fingerprints from the murder weapon and the bowls and chopsticks. No one other than Liu Jianren was found.
fingerprint."
Xu Tiannan shook his head and continued to look around the room. This was an old house from the 1990s. Except for the carpet-covered area, the rest of the furniture in the room was basically white or light in color.
Therefore, after checking all parts of the room, he said to Li Mengxue: "We need to check the fingerprints in all areas of this room."
Fingerprint collection is the most common task of the forensic team. It usually requires collecting fingerprints from a murder weapon, a certain part of the body of the deceased, or a certain area. The commonly used methods are visual inspection or amplification with metal powder, magnetic paint, etc., but
Fingerprint collection on a large scale inevitably requires the use of some kind of special equipment.
Therefore, Li Mengxue also asked in surprise: "Is it really necessary to collect fingerprints from the whole house?"
Xu Tiannan: “Let’s start taking action.”
Although everyone was reluctant at this time, out of trust in Xu Tiannan, everyone rushed back to the police station. Under the command of Li Mengxue, they brought in many fluorescent lamps and placed them behind the crime scene.
Various angles were adjusted to target every corner of the room.
Later, Li Mengxue took out a small carton, which was filled with 6 bottles of dark brown glass reagent spray bottles, which contained silver nitrate solution. Before handing it to everyone, he did not forget to specially warn: "Ten million dollars."
Don't spill it, this is very expensive!" (Note)
Xu Wudi took the watering can and murmured in a low voice: "It's better now! Ever since Fourth Master became the detachment leader, you can use this kind of good thing casually. If it were in the past when Du detachment was here, not even a hair would be given..."
"Invincible, shut up!"
Li Mengxue slapped the opponent on the head and taught him a lesson: "Don't be disrespectful to the deceased! Get to work quickly!"
…
Ten minutes later, everyone sprayed silver nitrate solution on all the surfaces in the room that could retain fingerprints. When several fluorescent lamps were turned on, the entire room was illuminated like daylight.
The fingerprints of the human body contain secreted oil and sweat, and the sodium chloride component contained in the sweat of fingerprints everywhere in the room undergoes a chemical reaction under the action of silver nitrate, decomposing silver ions, and the furniture everywhere in the room
Black fingerprints gradually appeared on the surface.
"Hurry up! Take the time to collect fingerprints!"
Because the silver nitrate solvent is prone to self-reaction under light, when Li Mengxue saw that the fingerprints everywhere in the room were gradually becoming clear and discernible, she immediately led everyone to complete the fingerprint collection work.
After doing all this, everyone compared for nearly an hour, and finally found to their surprise that although the Tattered King and Liu Jianren fought in this room and caused each other's death, no one related to them was left in the room.
Fingerprints, and in this collection, all fingerprints belong to Liu Jianren only.
