Return from Liu Wentao without success.

It seems to be expected.

It seems unexpected.

In the process of inquiry, Zhong Tianzheng did not induce him to confess and strive for good performance, let alone draw cakes for him.

The next whole day.

Zhong Tianzheng sat in front of the computer and watched the back of a middle-aged duck tongue hat photographed by street surveillance without any contrast again and again.

He always believed that these two cases were definitely not isolated.

"Wang Yiwei hasn't moved since the car accident, has he? After further investigation, if they have a fight in the car, they will leave some clues. "

Zhong Tianzheng looked down and read the inspection results of the extract in the car.

"Why do you want to get the information about the possible leftovers on the car? Haven't the relevant departments already extracted it? And don't you have to watch this surveillance? You've been watching it all day. "

Ah Xiang looked at Zhong Tianzheng, who was stunned, and said with worry, "don't worry about this case, right?"

"When I was watching the surveillance video, I kept thinking about a problem, and then I found something."

Zhong Tianzheng did not take over the topic of Ah Xiang, but suspended the picture and pointed to the back photographed in the monitoring.

From the video.

This man has a slight hunchback.

On his left hand was a lighted cigarette.

This is the only action of the man recorded in this monitoring picture.

Zhong Tianzheng's voice was not loud and seemed to be talking to himself: "you said, why did he smoke with a cigarette in his left hand?"

"Ah?"

Ah, Xiang was stunned.

She didn't understand what Zhong Tianzheng meant by asking.

"What's the problem with a cigarette in your left hand? Isn't this a very normal thing? "

Ah Xiang thought for several seconds, but she didn't expect Zhong Tianzheng to think about the significance of this problem.

"No, no, no, this is not normal."

Zhong Tianzheng felt out a cigarette to light it for himself.

At this time, he is holding a cigarette in his left hand.

"I have seen the pictures and reports of the wound on Wang Yiwei's shoulder. From the photos and the explanation given by the doctor, the inside of the knife wound is slightly to the left and tends to tilt to the left." Zhong Tianzheng vomited smoke and continued: "this shows that when the murderer held the knife, he held the knife in his right hand."

"He's not a leftist?"

Ah Xiang was slightly stunned. She could only hear this meaning from this sentence and explained, "but what does this have to do with cigarette in her left hand? Although I don't smoke, in my impression, there is no obvious difference between which hand is used for smoking? It has nothing to do with the dominant hand or the right hand. "

"This is what everyone ignores. It's a small detail that everyone won't notice."

Zhong Tianzheng grinned and explained in a steady tone: "like me now, I sit in front of the computer. When I watch the monitoring, I may use my right hand to control the mouse to control the progress bar, so I habitually use my left hand to hold a cigarette."

"However, in daily life, when we relax and even walk, when we don't need to do anything with our right hand, we will habitually use our right hand to clip cigarettes. Have you noticed this?"

Zhong Tianzheng focuses on explaining the action of smoking, using the difference between left and right hands.

"Ah?"

Ah Xiang seemed to have some feeling and frowned and thought.

"Remember, your father or your grandfather, when they usually smoke and don't use their right hand, do they use their right hand to hold cigarettes?" Zhong Tianzheng followed the guidance and continued: "besides, Liu Wentao, he smoked twice in a row. Did he use his right hand to clip cigarettes? I must have used my right hand. "

"As soon as you say it, it seems that this is really the case!"

Ah Xiang suddenly woke up, and Shui Lingling's big eyes widened: "that is to say, the action of smoking cigarettes has nothing to do with the habitual hand. Holding cigarettes in both left and right hands is a very habitual action. Only when you need your right hand to do other things, you can hold cigarettes in your left hand."

This is a small detail that is very easy to be ignored and not obvious, and there is no obvious distinction between habitual hand holding cigarettes.

"That's the truth."

Zhong Tianzheng nodded knowingly: "although this is just an insignificant action in daily life, it is really a small habit that everyone will have."

"For example, when the mobile phone has just developed and has not reached the level of one person, when everyone squats in the toilet, they must be bored. Look ahead or look around. More people must have seen the shampoo or shower gel directly opposite their bathroom and see their formula?"

In order to show his foothold, Zhong Tianzheng confirmed it again: "now, when we chat on wechat at night, as soon as you tell me you're going to the bathroom, I can immediately think that your elbows must be on your thighs, and your left and right hands are operating your mobile phone to chat. If you're reading a novel, it's likely to be holding your mobile phone in one hand, Click with your thumb to turn the page. "

"Exactly!"

Ah, the sound of incense increased a few points.

It's just.

When she looked at the clock, her eyes were a little more strange and... Alert?

Zhong Tianzheng has a feeling.

Immediately rolled his eyes in return.

"You just said so much, which fully verified the strangeness of the scene that the man was monitored and photographed when he left." Ah Xiang took over the topic and began to analyze: "from the analysis of the wound on Wang Yiwei, it can be concluded that the killer's habitual hand is also his right hand, so his smoking habit will be in line with what you just said."

"Why doesn't he have a cigarette in his left hand?"

Zhong Tianzheng added: "there are very few times, even if you don't use your right hand, you may habitually clip cigarettes with your left hand."

"Leaving aside a few cases, there is only one explanation."

Ah Xiang said, "although we don't have the scene of their fight, we can imagine that when he started to fight Wang Yiwei in the car, Wang Yiwei must have resisted. Halfway through the resistance, the murderer's left hand was also injured!"

"Ideally, that's why he didn't take a cigarette with his right hand when he left."

"Yes."

Zhong Tianzheng nodded meaningfully.

Ah, Xiang's statement is completely correct.

The killer is in the car. His left hand must have been hurt.

"That's why you proposed to search Wang Yiwei's car again. If he was injured in the process, there would be blood residue or a wound on his arm."

"Right."

Zhong Tianzheng snapped his fingers and grinned, "but I don't think he is likely to leave blood on the car."

"Can you guess that?!"

Ah Xiang raised her eyebrows and looked at him with big eyes.