"That's right, if you think about it, when you usually close this kind of window, do you just pull it with your hand, and you will habitually think that it has been locked, but some old windows are somewhat problematic, and many times they are just closed, and they can be opened directly from the outside. ”

Qian Qianyi thought about it, it is true, there are a few windows in their technical group that are like this, can they be locked with the fate, sometimes they are closed, and they can't be opened with all their efforts.

If the murderer stuck the window in advance and made it look like it had been locked, in such a cold weather, the window was closed for a long time, Li Lanke would not be okay to push and pull the window to play while taking a shower, so she always thought that the window was locked, and she didn't notice that someone had tampered with it at all.

This idea opens up new ideas to crack the murderer's entry into the sealed bathroom, but there are still things that make him wonder.

"If the murderer really used this method to sneak into the deceased's bathroom on the night of the crime to commit murder, then why did he use sand to jam the window slot, instead of directly destroying the lock bladder, or using other things to get stuck in the lock, the sand is fluid, if the window is closed strongly, the sand can't be stuck at all. ”

"I have also thought about this, but it can be seen from the scene of the crime that the murderer is very careful and rigorous. Ye Fan shook his head and said: "Destroying the lock gallbladder, or using other things, will leave traces, and you can't hide from the technical means of criminal investigation, but unlike mud and sand, the window groove is easy to fall sand and dust, and it is not easy to clean up, even if the police are at the scene, they will not easily notice, and even if they do, it will only be ordinary dust." ”

Speaking of which, Ye Fan had to admire that this murderer's mind was really too delicate.

At the scene of the crime, she relied on her intuition and adhered to the principle of not letting go of any subtlety, and asked the technical police officers to collect the sand and sand of the window slot, and then, to be honest, her mind was on the footprints on the exterior wall and the suspicions on the deceased, and she had long forgotten this.

Even after thinking hard about the murderer's way to enter the seal, he didn't put the suspicion on these small pieces of sand.

It wasn't until Fang did an autopsy on the deceased in the car accident in the dissection room, and saw the sand particles stained on the blood sausage, and a flash of inspiration, but unfortunately he couldn't grasp the key point, and then Xiao Fang and Hua Ming talked about the problem of the window, and she suddenly grabbed the spiritual point, all the way over, thinking about the deduction, the more she thought about it, the more she felt that it was very possible, and then seeing the analysis report, she could almost verify her inference.

Qian Qian thought about it for a while, nodded in agreement: "Indeed, not only will there be no traces of falling, but with sand, even if Li Lanke accidentally finds that the window is not locked, he will only think that the window has not been cleaned for too long and has accumulated too much sand, so he will not be suspicious." ”

Xia Dong exclaimed: "This murderer's mind is really too meticulous, first stuck it with sand in advance, so that the window was in a false lock state, and on the night of the crime, he climbed down the fourth floor from the top of the building, opened the window, quietly entered the bathroom, and killed the victim Li Lanke." ”

Qian Qian followed his words and added: "The sand used to jam the window groove must not be less, when the murderer leaves, he should remove the sand and soil of the window groove, I remember the green belt under the bathroom window, that bit of sand and soil is thrown down, like water dripping into the sea, without a trace, finally, the murderer left from the window, without the soil of the window slot, the window can be easily locked, and when the police arrive, they see that it is a sealed crime scene." ”

Ye Fan nodded, but still maintained a rigorous attitude and said, "Whether the truth is as we deduced still needs to be further confirmed." ”

Qian Qian: "I understand, it's too late today, tomorrow I will take someone to take the soil from the green belt downstairs of the apartment to come back for inspection and composition comparison." ”

"You can take the sand and dust falling from the windows of the user's bathrooms on other floors on the same side to analyze it to see if only the sand and sand of the window grooves in Li Lanke's bathroom have humus. Ye Fan reminded again.

"Okay, got it. Qian Qian gestured to OK.

"I'll go to the Chang team and talk to you, you guys are busy first. Ye Fan said and was about to leave the office.

"Wait. Xia Dong stopped her in a hurry, and said helplessly: "Don't be in a hurry at this time, you haven't eaten dinner yet, let's go back to the office to eat first." ”

Ye Fan originally wanted to say no, but at the insistence of the two, he still went back to the office of the forensic department, ate the reheated lunch in three or two clicks, and then ran away again, seeing Xia Dong shaking his head with a smile.

The team was in the office, standing in front of the whiteboard, with a pensive look on his face.

On the whiteboard, there is a photo of Li Lanke, and a relationship analysis chart is written with a black oil pen, in which the names of Dai Lumao and his wife are highlighted in circles, and the pen in his hand is dotted behind Liang Yunyue, with a big question mark.

Ye Fan knocked on the door, and only pushed the door in after getting a reply from inviting in.

When the Chang team saw that it was Ye Fan, he immediately beckoned: "Pingfei just came over, your analysis is very reasonable, this Liang Yunyue seems to have a problem......

"Chang Team, I just came from the technical team and found a problem that I had overlooked. After the regular team pulled her to talk about Liang Yunyue's question, Ye Fan spoke.

"Qian Qian, there is a new discovery there?" Chang Team listened, his eyes lit up, this matter Ye Fan couldn't wait to come to him, it must be a major discovery.

It has been several days since the incident, and the best golden period for solving the case is about to pass, although the interpersonal relationship of the deceased and the equipment used by the murderer to climb have the direction of investigation, but the progress is not great, they don't even know how the murderer entered the bathroom, and they have not been able to find a similar suspect in the surveillance, which can be said to be very tricky.

After Ye Fan said the sand and sand in the bathroom window slot, he said: "We suspect that the murderer stepped on a little near Li Lanke's apartment before the murder and entered her apartment. ”

He was still thinking about the murderer's method of entering the bathroom, but he didn't expect Ye Fan to immediately send him this good news, he was 100% convinced of Ye Fan's inference, and without a trace of hesitation, he immediately opened the door of the office, called Gu Yuan, who was busy at the desk, and asked her to immediately contact the community property to get the surveillance video of the community a few days before the incident.

When he turned back to the office, Team Chang's face was still full of excitement, and he even gradually developed a belief that as long as Ye Fan was there, there would be no case that their criminal investigation team couldn't solve.

"Ye Fan, you are the lucky star of our criminal investigation team, haha. Chang team laughed and slapped her shoulder subconsciously with his wide and powerful palm, and stopped abruptly when he was about to pat her shoulder, and withdrew his hand in a sneering manner.