The photo is of an ashtray on the coffee table, just to the left of the body. There are two bits of cigarette ash left in it.
But there are only cigarette ashes and no cigarette butts.
Lu Chuan has read the autopsy report. The tips of the index finger and middle finger of the deceased Zhang Wen's right hand were burnt yellow, with obvious traces of smoke. He obviously had a history of smoking.
For a smoker, it is normal for there to be ashtrays in the ashtray on the coffee table.
The question is, there is cigarette ashes, but why is there no cigarette butt?
Lu Chuan looked surprised and continued to flip through the photos. After a moment, a photo of a trash can in front of the deceased's house appeared on the screen.
A cigarette butt was at the bottom of the trash can!
When you zoom in on the photo, you can see that the trademark on the cigarette butt has been burned out, and the end of the filter that connects to the tobacco has been burnt.
Lu Chuan himself smoked, and he knew that this situation occurred because the smoker did not stub out the cigarette butt, causing the cigarette butt to burn out naturally.
Is this cigarette butt left by the deceased Zhang Wen?
Lu Chuan frowned and flipped through the photos next time. This time he only flipped through a few photos, and a cigarette box appeared on the screen.
Lu Chuan numbered every item on the coffee table and took photos.
Hongmei brand cigarettes, there is a lighter next to the cigarette case, this should be the cigarettes Zhang Wen usually smokes.
These cigarettes are not expensive. When Lu Chuan was in college, his classmates often bought these cigarettes, and Lu Chuan also smoked them.
So I am quite familiar with this kind of cigarette.
It was precisely because of familiarity that the problem was discovered.
The filter tips of Hongmei brand cigarettes are different from the filters of ordinary cigarettes, with light yellow spots distributed around them.
However, there were no light yellow spots on the cigarette butt filters in the trash can.
In other words, the burnt cigarette butt without the brand mark was most likely not smoked by Zhang Wen.
If Zhang Wen didn't smoke it, who left it?
A flash of excitement flashed in Lu Chuan's eyes. Could it have been left by the murderer?
Turning around and looking at the sleeping Liu Guodong, Lu Chuan decided to wake him up. The cigarette butt was not collected as evidence, so he now needs to go to the scene for re-examination.
However, there are regulations for re-examination. One person cannot enter the site alone. The re-examination work needs to be carried out by at least two people, and a third person is also required to witness it.
Of course, rules are dead but people are alive. In most cases, it is the auxiliary police who act as the third witness.
This is like an older middle-aged man. Even if his prostate rebels and he cannot go into battle, his fingers can still be used after all.
Liu Guodong, who was woken up in a daze, was startled by Lu Chuan's green eyes.
"clue?"
Lu Chuan nodded excitedly, his hair blowing up like a messy chicken coop: "The cigarettes Zhang Wen smokes are from Hongmei, but the cigarette butts in the trash can are not from Hongmei cigarettes. I feel there is something wrong."
After listening to Lu Chuan's explanation, Liu Guodong straightened up instantly. After working for a day, he just couldn't keep up with the physical strength, which didn't mean he didn't have the intention.
"Let's go to the scene!"
"Do you want to report to Team Qin?"
"No, let's go to the scene and bring the things back first. After collecting the DNA information on them, we'll wait until the evidence is conclusive!"
Ginger is still old and spicy, and he will not do anything he is not sure about.
Liu Guodong and Lu Chuan left without disturbing anyone. Conference room No. 1 was still noisy, and Qin Yong's angry roar spread throughout the detachment building.
Of course, no one is paying attention to the current survey at this time, and their task has basically been completed.
The reason why Liu Guodong didn't go home was that he was embarrassed to leave Lu Chuan here alone.
On the other hand, the case was not solved after all, so he left directly. That was disrespectful and provocative to Captain Qin Yong.
How could Lao Jianghu do such a thing?
Looking at Lu Chuan, who was full of energy and with green eyes, Liu Guodong seemed to have returned to the time when he first joined the company twenty years ago.
"It's great to be young..."
after an hour.
Next to the DNA detector, Liu Guodong just stared at Lu Chuan's hand operating the instrument: "How is it?"
call!
Lu Chuan took the comparison report and let out a long breath: "The DNA information on the cigarette butt has been confirmed not to be Zhang Wen's."
Dry!
Liu Guodong took the report excitedly and patted Lu Chuan on the shoulder: "Well done!"
"Your boy has made a meritorious service... huh?"
Liu Guodong's excited expression gradually solidified, and then turned into incredible: "This DNA match..."
Lu Chuan shook his head: "Yes, the DNA information on the cigarette butt does not belong to Zhang Wen, but it has a parent-child relationship with him..."
"The cigarette butt was left behind by his son."
Grass!
Five twenty in the morning.
Twenty-six hours have passed since Zhang Wen's death. In conference room No. 1, there are still no clues to the breakthrough of the case.
As the captain of the criminal investigation detachment, Qin Yong has stepped from the frontline criminal policeman to today, and has handled no less than 20 murder cases.
Although most of the cases have been solved, no one can guarantee that a murder case will be solved.
As for Zhang Wen's murder case, no valuable clues have been found so far.
Generally speaking, there is a saying that there are seventy-two golden hours in solving a murder case, which means that within three days after the incident, the hope of solving the case is greatest.
It’s not that the case cannot be solved after this time, it just requires more energy and time.
"Everyone, conduct a comprehensive survey of the area around Zhang Wen's house. No one should be missed. All visits and investigations are in place."
"The scope of the surveillance investigation must also be expanded. All surveillance videos of all intersections and stores within one kilometer of Zhang Wen's home will be reviewed!"
In the absence of any clues, the crowd tactic is the best weapon for the criminal police to solve the case.
This is also one of the reasons for the golden seventy-two hours. Three days of fierce fighting using the human sea tactic is the limit for ordinary people.
boom!
The door to conference room No. 1 was violently pushed open, and everyone's eyes were focused on the door.
If you dare to enter conference room No. 1 at this time, everyone wants to see who it is.
Qin Yong's attention was also attracted, and he found that it was Liu Guodong from the current survey office, his gloomy expression slightly brightened.
Liu Guodong is a veteran and joined the police at the same time as Qin Yong. Although he does not have an official position now, he leads the field survey and can be regarded as the technical backbone of the detachment.
Qin Yong looked at the time. It was almost six o'clock in the morning: "Old Liu, why haven't you gone back to rest yet? You have been busy with surveying during the day. You..."
Liu Guodong shook his head and interrupted Qin Yong directly: "Team Qin, we have a clue!"
There is a clue!
Qin Yong jumped up from his seat, his tired eyes glowing with a fierce glare: "Have you found anything during the current survey?"
Liu Guodong nodded heavily and handed Qin Yong the DNA information comparison report collected between Zhang Wen and the cigarette butts in the trash can: "The cigarette butts at the door of Zhang Wen's house do not belong to the deceased, but to his son!"
His son's?
Qin Yong's heart flashed with ecstasy!
Zhang Wen's son Zhang Minlu does not usually live with Zhang Wen.
Yesterday morning, Zhang Minlu went to pick up Zhang Wen for a physical examination and reported the case when he found that Zhang Wen was dead.
Since the two don't live together, how come there are cigarette butts that Zhang Minlu smoked in Zhang Wen's house?
Could it be that this guy smoked a cigarette when he reported the crime after seeing his father die?
"Old Liu, the case is solved and you are the first to make the investigation now!"
"One group and two groups, set off with me immediately to Zhang Minlu's house!"
