As soon as he got off the plane, He Yuanfan took a taxi directly to Zhang Wu's office.

Halfway through, I finally talked to Zhang Wu on the phone.

"Hey, what's going on?" He Yuanfan asked.

Zhang Wu: The timing of their move was a bit hasty, and it is estimated that the private visit is only halfway through now.

If there is no evidence and the case is suspicious, arresting the suspect in advance is not the best plan.

You know, they only have 48 hours of detention, after which if they can't be convicted, they can only let them go.

Considering the influence of this case, when the time comes, Zhang Wu and his officials are afraid that they will be burdened with huge public opinion pressure.

"There are media reports about the serial case, because the victims in recent years are all children, which has caused panic in the whole city, and many parents have called us and asked us to do something. Zhang Wu explained, "You know, leaders also have children. This matter has also attracted great attention from above, and our boss has no choice but to set up a military order, and within 48 hours, this case will be solved!"

"So there is no choice but to strike in advance. And in order to minimize the impact, we also squatted until the evening, and only carried out the arrest operation after she got off work. So far, no one outside knows about it, except for you. ”

He Yuanfan nodded, then there was no way to do it: "How is it going?"

Zhang Wu was silent for a while: "It's not good, she completely denies any criminal acts, no matter what we interrogate, it has no effect." Moreover, I don't think she's like a murderer. ”

You see, something went wrong.

48 hours, like a sword of Damocles, hung above Zhang Wu's head.

When the time comes, be ready to accept the criticism of the public.

"I'll go downstairs to you, come and pick me up. "He Yuanfan's side has arrived.

"You want to come up?" Zhang Wu was stunned.

"I'm just looking, trust me, I can help you, I have new clues. He Yuanfan stood at the door.

Five minutes later, Zhang Wu came down, and there was a middle-aged man by his side.

This is Zhang Wu's boss, the legendary detective in Shuzhong, Wang Wei.

"You are He Yuanfan?" Wang Wei frowned.

"Yes. He Yuanfan nodded.

Wang Wei didn't speak again, and the three of them went directly to the interrogation room. In order to be able to bring He Yuanfan up, Zhang Wu did a lot of work in Wang Wei, including the help He Yuanfan provided to him in terms of thinking.

And said, He Yuanfan has important clues in his hands.

The interrogation room has a large glass window, which is a one-way perspective glass, so that the outside can see inside, but the inside cannot see the outside. Inside, the agent is making routine inquiries, but the harvest is very little.

Next to him, Zhang Wu introduced: "So far, there has been no progress. We are looking into the surveillance, but because the volume is too large and there are many blind spots in the city's surveillance before this year, we have not found anything. ”

"By the way, it's time to get on the polygraph. ”

"If the polygraph results are still fine, then we may really be ...... Caught the wrong person!"

Zhang Wu's face was very unwilling, he was not afraid of pressure, but he couldn't accept that the murderer in his hand had flown away!

If it weren't for Wu Huamei, who would be the real murderer of his mother?

If it weren't for Wu Huamei, the sea of people was vast, ten years had passed, and the sea had changed into a mulberry field, and Zhang Wu would no longer be able to find the original murderer.

For him, for Mulingfeng, it is the collapse of the ultimate goal of life.

It's worse than letting them die.

"Hmm. Wang Wei agreed to go up to the polygraph.

This cannot be used as evidence for a conviction, but it can provide a direction for the detectives to detect.

Is the murderer this person?

If the agent is really unable to tell, then the machine can sometimes alert the agent.

Because data doesn't lie.

Hearing the lie detector, He Yuanfan's eyes burst with light.

He doesn't believe in polygraphs, because it's true that data doesn't deceive, but data comes from machines, and people ...... You can fool the machine, he promised.

But he believed that no one could fool his eyes.

Whether it is Wu Huamei or not, you will know the answer immediately.

Next, you just have to answer yes or no. If you want to prove your innocence, please cooperate with us, otherwise...... We will not spare a single criminal. ”

"Your name is Wu Huamei. ”

"Yes. ”

"You are the driver of the Tianfu City Bus Company. ”

"Yes. ”

"You are the murderer of Liu Ermao. ”

"It's not. ”

"You ......"

The polygraph questioning begins, which is an ongoing process that requires repeated tests.

Normal people can't hide the lie detector at all.

The simplest point, the same question, asked ten times, your answer is the same?

Again, there may be a question, because how can an unimportant answer be the same every time? It's normal to have discrepancies. Even if the answer remains the same, it is normal for the mentality to fluctuate.

It's different, and there may be a problem, because no matter how many times you ask the real content, the answer shouldn't change, right?

That's why it can't be taken as evidence. Because there are so many questions and answers that are simply not moot.

But that's why it can help detectives solve crimes. Because combined with the various physiological feedback provided by the polygraph when answering questions, it is possible to determine whether it is true or false.

Therefore, the polygraph needs a master who can read and understand the data to control.

"It's not her!" He Yuanfan muttered in a low voice, his whole scalp tingling.

The polygraph test is not over yet, but He Yuanfan has already drawn the answer from the current questions and data, the murderer ...... It's not Wu Huamei!

It's not scientific!

This clearly contradicts his memory!

It's obviously Wu Huamei, why is this happening?

If it's not Wu Huamei, then who is it?

There are too many questions lingering in He Yuanfan's mind.

Zhang Wu and Wang Wei glanced at He Yuanfan in surprise, because the polygraph test has not yet ended, how did He Yuanfan get the answer?

Could it be that he had to come up with the answer before the most senior polygrapher in the bureau?

He's so powerful?

Twenty minutes later, Wang Wei and Zhang Wu were even more surprised.

Because the results of the analysis are out, there is really no problem.

Wu Huamei, with a high probability, is really not the murderer of the serial murder case!

The case has completely reached a deadlock.

They have a military order!

"He Yuanfan, it's your turn. Wang Wei patted He Yuanfan on the shoulder, they had failed. The rest depends on He Yuanfan's key clue.

He Yuanfan nodded, cleaned up his mood, and pushed the door in.

"Hey, young man, why are you here, I'm really not a fierce ......" Wu Huamei, the driver's eldest sister, saw He Yuanfan as if she had seen a savior, but stopped halfway through her words.

She's not stupid.

Normal people, how could they be here at this time?

"Sister Wu, don't worry, if you are really wronged, I guarantee that you will be fine. He Yuanfan showed a smile.

The driver's eldest sister was infected by his smile and also showed a smile.

The two smiles seem to be the same, but the meaning behind them may be completely different.