Criminal Investigation Notes

Time passed quickly. At night, the weather became dull again, the air was full of sticky, and a thunderstorm was about to fall.At 6:30 in the afternoon, Song Wen gathered all relevant personnel for a meeting again, and specifically called Lin Xiuran who had just returned from the hospital.

The atmosphere in the conference room became serious for a while.No one thought that when the case was about to become clear, they were caught in a dilemma.There are no key witnesses and no key physical evidence. All they can prove is that Lin Wanwan knew about Guo Wei's possession of poison.

What happened that night?

The relevant cases have been reviewed several times, and everyone is tired. Song Wen listed all the relevant information and deduction process of the case on the whiteboard.

On the left side of the whiteboard is the derivation process assuming that Guo Xu is the principal offender and the criminal motive. On the right side of the whiteboard is the derivation process assuming that Lin Wanwan is the principal offender. In a corner under the whiteboard, others are written.

The one on the left is clear, but the one on the right is very rare. Song Wen drew a question mark, and then drew a circle on Lin Wanwan’s name: "Lin Wanwan’s matter has not been investigated. Let’s assume that if things happen Unlike what Lin Wanwan said, Guo Xu is an accessory, or Guo Xu is unknown, Lin Wanwan is the main culprit, then why did she kill her classmates, and how did she use Guo Yu’s chocolate and poison to kill herself Classmates?"

When asked this question, everyone was silent, Fu Linjiang lowered their heads, Zhu Xiao also leaned aside, Lao Jia was a little listless, and Lu Siyu didn't say a word. They couldn't draw any conclusions from what they knew now.

Previously, Zhu Xiao quickly sorted out the testimony of surrounding witnesses. Some details were a little bit beyond Song Wen’s expectation. He thought that Lin Wanwan’s frequent changes of work locations might be a matter of time, or she was fired by her boss, but During their investigation, they found that Lin Wanwan resigned almost all of the work and refused the boss's salary increase.

This girl seems to increase her social experience in those shops with her mood.

During their phone investigation, everyone reported that Lin Wanwan was docile, humble, and silent.It seems that apart from telling a lie to them once, he is so innocent that there is no stain.

"Let's look at all the material evidence again." When the case reached a deadlock, Song Wen could only start to sort out the relevant evidence.

Xu Yao said: "Xiaocheng, you bring all the photos, and we will go through them again."

Not long after, Xiaocheng copied all the materials and showed the evidence pictures of the scene one by one on the slide projector. When everyone saw something suspicious, they would ask questions.Waiting for the photo to reach the quilt that Ma Aijing had been holding, Lin Xiuran frowned and pointed at one of the corners and asked, "What is that?"

Xiaocheng zoomed in on the photo at the scene, and it could be seen that there were two oval brown marks on the quilt.The two elliptical points are almost parallel to each other.It's about ten centimeters apart.

"Maybe it's the mark of the chocolate that has been rubbed up." Xiaocheng zoomed in again, now he can see a lot more clearly.

"No, I didn't get on it." Lin Xiuran spoke a few steps forward, and called out the photo of Ma Aijing's death. At first, Ma Aijing's quilt covered the lower half of her face, and that position looked even worse. It is obvious that it is not far from the victim’s ear.

Lin Xiuran made a demonstrative action: "It was left by the chocolate stained on the fingers of his right hand when the suspect pressed the quilt tightly."

When he said this, everyone was shocked. They looked for physical evidence before confirming the cause of death. At that time, they focused on finding things related to poisons, but ignored them. The suffocated victims also left traces around them.

Xiaocheng hurried to the material evidence room, took the quilt over, and followed the crease direction on the quilt. Those two marks happened to be left when the suspect held the quilt tightly and pressed it down.

"Isn't this left by someone trying to lift the quilt?" Fu Linjiang looked at the traces.

"No." Xu Yao picked it up and took a closer look. As a traceology expert, she immediately made her final conclusion, "This trace needs to be held tightly by the quilt and pressed with great strength to cause it. The corresponding position next to the quilt also has the same wrinkles, indicating that the murderer held the quilt tightly with two hands at the time, and went down together. The chocolate should be covered when the candy heart was wet, so it penetrated the texture of the quilt, in short, this trace It must have been left by the murderer who killed Ma Aijing."

Song Wen asked Xu Yao: "Is there any value in this trace?"

Xiaocheng hurriedly stepped aside, Xu Yao lowered her head, carefully checked the two traces, and thought for a while: "There is enough chocolate to be extracted, but the fiber on this quilt is not enough to extract fingerprints. Having found these two traces, we cannot prove whether this trace was left by Guo Wei or Lin Wanwan."

The methods for extracting fingerprints are changing with each passing day. Conventional powders or magnetic powders, physical and chemical ones, and even the more advanced Ninghai Delin or fluorescent reagents, but no matter which method is used, it is not enough to extract these two fingerprints. .

This sentence caused everyone to fall into silence again, and the flame of hope just found was extinguished.

Lu Siyu stared at the photos of the exhibits printed on the table and pressed his lips lightly. At this scene, they had reasoned and deduced some relationship between the characters. But now, he has a slight doubt about his reasoning. Suddenly, he felt that the things he saw were what others expected him to see, clean and deliberate...These things were like fog, hiding the motive of crime underneath.

Thinking of this, Lu Siyu blinked and said, "I think we have entered into a misunderstanding now. We are all obsessed with what happened that night. But I think it is these four that we should dig out. What happened in the year, what happened in this dormitory, what kind of people they are."

Four years, a bedroom, day and night, one sentence, one action, there may be conflicts or intensifications, today you are friends, tomorrow may quarrel, this relationship is definitely not a few other bedroom girls can see through.But now that the direct parties have died, they can only investigate, dig and speculate from the surrounding environment.

Old Jia said, "No, isn't it clear? The poison in Guo Wei's possession, the chocolate that Guo Wei bought, Guo Wei has hatred with them, and I want them to die, I just don't understand, why do you have to doubt Lin? Wan Wan, what do we suppose she hasn't done before?"

Song Wen thought for a moment and said: "There are still doubts in the case. Let's check it more carefully, Zhu Xiao, we will work overtime at night and make a follow-up call for the family. Make sure that each family understands it clearly."

Zhu Xiao nodded: "Yes."

Song Wen put on the cap of the pen, "I'll review it again later. Think about any breakthrough points."

Breakthrough point...A new breakthrough point where you can ask the truth. All people frowned and meditated.

Song Wen turned his head and looked at Lu Siyu. He lowered his head and frowned slightly. Junxiu's face became paler and he seemed to be lost in thought. When he saw Song Wen's gaze, he raised his head slightly and said: " I think we can test her."

"What temptation?" Song Wen looked at him sideways.

"Use Guo Hua." Lu Siyu looked at him directly with sharp eyes.Now, only the police can know Guo Wei's state. If Lin Wanwan's description of the night contains lies, then she may be the one who doesn't want Guo Wei to wake up.

Fu Linjiang immediately agreed: "I think this plan is feasible, and we don't have any other better methods now. It is only estimated that the cooperation of the forensic doctor of Lin will be able to perform the trick more realistically."

Song Wen nodded and agreed to the plan: "Then we will check the process."

After the simple arrangement, Song Wen arranged various time points and considered for a moment: "I will come first. After I go out, Lao Jia will come in, and Lu Siyu will try her."

Lu Siyu was a little surprised at this arrangement: "Why is it Lao Jia?" He asked this sentence without much consideration, and it felt wrong to say it.During the days when he joined the company, he had not much communication with Lao Jia.This old detective is obviously not a good helper to cooperate, and he has been insisting that Lin Wanwan is not guilty, and he certainly cannot cooperate well with him.But when he asked just now, he felt a little disgusted, and it was like robbing him before taking revenge on Lao Jia. Lao Jia glanced at him and didn't speak.

Song Wen explained: "Just now, a few of us went in and asked separately. She and Lao Jia said the most things, and their expressions were the most relaxed. I want to try my best to put her in a comfortable environment."

Lu Siyu nodded and agreed to Song Wen's arrangement.

After making arrangements, Lu Siyu and Song Wen entered the interrogation room first. Lin Wanwan had just had a short rest and saw the two of them coming in and sitting upright, and said, "Good evening." There was nothing in the interrogation room. There are no windows for the clocks, and all the ventilation depends on a small exhaust fan.She judged the time by her schedule and biological clock. It was already night, and she had been questioned in this small interrogation room for a day.

Song Wen didn't answer her. He sat opposite her and adjusted the lamp beside the table. Lu Siyu sat aside and spread out the book.

"Want to see the tragic situation of your classmate after his death?" Song Wen did not ask a question this time, but spread out a few photos and placed them in front of her.The girls on the screen died shockingly.

Lin Wanwan's eyes drooped. There was no panic, but she didn't open it either. She hesitated for two seconds and said, "No, I'm almost one of them."

Song Wen asked the second question: "You were the only sober person at the time. Why didn't you call the police right away? Don't be afraid to explain. The doctor present said that you were extremely calm."

Lin Wanwan licked her lips: "In the beginning, I thought everyone was just ordinary food poisoning. I opened the drawer and wanted to take medicine for the stomach and intestines. Then I thought about it. Maybe everyone’s reaction now is because Guo Wei asked The poison that arrived, I was very scared at that time, and did not call the police when I hesitated. Later, the poison came out faster than expected. When I wanted to call the police, the poison was in my body and I couldn’t react quickly. Only had time to make an emergency call."

Song Wen's eyes narrowed slightly: "These sound like excuses and excuses."

Lin Wanwan shook her head lightly: "I have nothing to excuse. Everything I say is the truth."

Song Wen looked at her directly: "Maybe this is just your way of exonerating sin."

Lu Siyu listened quietly, Song Wen was trying to bring Lin Wanwan's emotions back to the scene, and he kept putting pressure on Lin Wanwan.

There was a knock on the door, and then the lock was reversed, and Lin Xiuran leaned in, "Team Song, can you come out?"

Song Wen got up. Lin Wanwan had also met Lin Xiuran when he was in the hospital. Knowing that he was a forensic doctor, her eyes followed him out of the interrogation room. Lin Xiuran and Song Wen were talking outside, the voice was not loud, but it happened to be heard inside. a little.

"Hospital...Telephone...Guo Wei, she...Well, wake up, you guys... confessions...maybe...new evidence..."

Intermittent voices came in, and Lu Siyu's eyes, which had been drooping all the time, lifted slightly, looking at Lin Wanwan who was opposite, and capturing the expression on her face.

She must have heard those conversations, the girl's face was swept away from tiredness and exhaustion, but there was a faint...Lu Siyu was a little indescribable, it was a strange expression.

At that moment, he realized that he might have thought the case too simple...