Bai Yunfei shook her head slightly, shook aside the bangs that were falling in front of her eyes, switched to a photo with a clear footprint and two shoe soles, and continued:
"After identification, the footprints left at the scene were of shoe size 42, but there were two pairs of size 42 labor protection shoes we obtained in the security room. How can we tell which pair of shoes left the footprints?"
"Looking at the degree of wear and tear on the shoes, they are all about the same," Liang Shi said.
"Yes, with the advancement of modern material technology and the improvement of people's living standards, it is now difficult for us to see seriously worn shoe soles. In order to find the pair of shoes that left footprints, we analyzed the residue left in the pattern gaps on the bottom of the shoes.
The soil was sampled.
Because abandoned rivers are soil that has been deposited for many years, their composition is very different from that of newly excavated soil at the construction site. By measuring the pH, mineral composition and organic matter content of the soil, we determined the factors that left footprints in the abandoned rivers.
These are the shoes."
Dr. Bai put a big check mark on the shoe on the right on the big screen, and the conference room instantly burst into warm applause.
The next task was the turn of the criminal investigation team. In order to speed up the progress of the case, Liang Shi ordered Meng Liang and Ma Yan to immediately confirm the owner of the pair of size 42 labor protection shoes. The other personnel continued to stay to attend the meeting.
After accepting the order, Meng Liang and Ma Yan walked out of the conference room and discussed for a while with the information provided by Dr. Bai. They thought it would be easier to separate the people who wore code 42 and code 43 first, so they went to the separate room where the suspects were held.
Detention room.
The first person they met was Ren Zhong. Although Ren Zhong has not been ruled out as a suspect at present, because Wang Hu left a big loophole, the police still trust Ren Zhong relatively.
"What size shoes do you wear?" Ma Yan asked.
"Ah, I wear size 44, what's wrong?" Ren Zhong replied.
"Size 44? But your labor protection shoes do not include size 44 shoes."
"Oh, you're asking about the safety shoes. Our safety shoes are all too large, so my safety shoes are size 43."
“Do you know what shoe sizes other people wear?”
"Others? Let me think about it." Ren Zhong tilted his head and thought for a long time and said:
"I remembered, Wang Hu's is size 42."
"How did you know?"
"When the shoes were distributed, Wang Hu wanted size 43, but after they were distributed, Wang Hu wore a size that was too big. He was making a fuss about changing shoes, so I have an impression."
"Do you know what size shoes the other two wear?"
"I don't know what size Zhang Jie and Li Qiang wear, I have no impression."
After individually questioning four security guards, Meng Liang and Ma Yan finally confirmed that there were two people wearing size 42 safety shoes, one was Wang Hu and the other was Zhang Jie.
When Meng Liang took photos of two pairs of shoes for them to identify, Wang Hu pretended to look at them twice and replied that he was not sure which pair of shoes was his.
Zhang Jie's attitude was much more serious than that of Wang Hu. He looked at the photo over and over for a long time, and in the end he shook his head and said:
"Not sure which pair is mine."
"Don't you even recognize your own shoes?" Ma Yan complained.
"Officer, you don't know, we have only distributed the protective shoes for less than a week. The styles of the shoes are all the same. We don't wear them very often. It's really hard to tell the difference between the same shoes." Zhang Jie explained with a bitter look on his face.
With.
After walking out of the detention room, Meng Liang and Ma Yan came to the corridor with frowns. They leaned against the wall and were silent for a while. Ma Yan asked:
"Team Meng, what should we do?"
"What can I do? I can't smell their feet." Meng Liang complained.
"I think you can." Ma Yan squinted at Meng Liang and said.
"You can do it too." Meng Liang breathed out and replied.
"No, I have a cold."
"I just took cold medicine."
"Hey, that's right, don't we have police dogs? Just call the police dogs to identify them. Why do you still need your pig nose?" Ma Yan said excitedly.
"Oh, that's right, why didn't I think of it and call the police dog to smell their stinky feet?" Meng Liang straightened up and took out the phone from his pocket, but when he was about to dial, he stopped and looked at
Ma Yan said:
"The scent identification of police dogs cannot be used as evidence."
Ma Yan stared at Meng Liang blankly for three seconds before she understood what Meng Liang meant. She turned around and walked back and forth in the corridor several times, then suddenly turned back and said:
"It doesn't matter. What we want is a confession. As long as Wang Hu extracts a confession, he will have everything."
"But will Wang Hu confess? He was so frightened at night that he didn't speak."
"Don't be afraid. Police dog identification cannot be used as evidence. Only professionals like you know that. Ordinary people don't understand. As long as we use a little trick, it will be fine."
"Is this legal?"
"It's legal, of course it's legal!" Ma Yan rolled her eyes at Meng Liang angrily.
Meng Liang and Ma Yan discussed it, brought Wang Hu and Zhang Jie to the police dog training venue at the same time, and said to them:
"We found the footprints of size 42 labor protection shoes near the entrance of the cave that we took you to identify yesterday, and found the shovel, hand saw and floor you hid in the grass not far from the entrance of the cave. After inspection by technicians, it was found that
The pattern on the bottom of a pair of size 42 safety shoes has the same mud as the river mud. Only you two of the four security guards wear size 42 safety shoes, so one of you must be the one who dumped the body."
Wang Hu and Zhang Jie had frightened looks on their faces after hearing Ma Yan's words, and waved their hands in denial at the same time:
"It's not me, it's not me."
"Now if any of you admit it, we don't need to proceed with the following steps. Tell me, whose shoes belong to them?" Ma Yan shook the pair of shoes in a sealed plastic bag in front of the two of them.
shake.
"It's not mine." Wang Hu denied.
"I don't know, I really don't know anything." Zhang Jie also strongly denied it.
"Well, since you don't admit it, then we can only invite our protagonist today!"
Ma Yan waved in the distance, and a young trainer immediately ran over with a fierce police dog. The police dog came in front of Wang Hu and Zhang Jie, opened its bloody mouth and howled at them,
It seemed like they could be torn apart in an instant.
Wang Hu and Zhang Jie curled up and hugged their legs to their chests, trying their best to avoid the bites of the police dogs. Of course, all this was planned in advance, and the handlers knew very well that they would never let the police dogs hurt the suspects.
Ma Yan waved her hand, and the handler grabbed the police dog and issued a command. The police dog immediately squatted quietly beside the handler.
"You also know that a police dog's sense of smell is extremely sensitive. It can definitely tell who is a good guy and who is a bad guy. Do you want to test the police dog's sense of smell? Or should you confess now?"
"I won't try, please, I didn't do anything, I don't want to try." Zhang Jie was the first to plead.
"It's not me. Those shoes really aren't mine." Wang Hu also denied it vigorously.
Ma Yan and Meng Liang exchanged glances, and Meng Liang gave her a positive nod.