A moment later, the phone was connected and the voice of a watercraft deliveryman came from the phone: "Hello, I am a watercraft, do you need any help?"

"I am from Blue and White University. Did you happen to send water today? For example, I collided with the road..." Xu Yuntian asked.

"Oh! You are from Blue and White University! Nothing happened to me when I delivered water today! What's wrong?" The voice of a water delivery worker came from my phone.

"Oh! It's nothing, I'm just asking casually, thank you!" Xu Yuntian quickly hung up the phone.

Then he said to Principal Fang: "There is no problem for the water delivery worker!"

"Uh! How do you make sure that the water delivery worker is fine?" Principal Fang looked at Xu Yuntian and said in confusion.

"Because the water delivery worker did not lie, it is no problem to rule out the water delivery worker." Xu Yuntian looked at Principal Fang and said.

Xu Yuntian judged from the sound of the water delivery worker's speech that the water delivery worker did not lie, because when a person lies, he feels nervous, his vocal cords change, and his voice will tremble.

Of course, this tremor is slight, which is not something that ordinary people cannot hear, and only those who have received special training can hear it.

Principal Fang believed Xu Yuntian’s judgment, “What about the second type?” Principal Fang looked at Xu Yuntiandao.

"How many teachers are there in the Teachers' Office?" Xu Yuntian looked at Principal Fang and said.

"There are thirty-eight teachers in this teacher's office." Principal Fang said.

Xu Yuntian calculated that there were 35 teachers who were poisoned just now, and there were still three teachers who were not poisoned. These three teachers were the suspects.

"Then the three teachers are still suspects. Where are the three teachers?" Xu Yuntian looked at Principal Fang and said.

Principal Fang turned his head and looked at Director Cai and said, "Go and call those three teachers!"

Director Cai looked around, two of them were present, and one teacher was missing. He immediately arranged for other teachers to call people.

About five minutes later, all three teachers were present. Xu Yuntian looked at the three teachers and said, "Where are you when these teachers were poisoned?"

"I'm going to class!"

"I've gone out to do business!"

"I've gone to the bathroom!"

Xu Yuntian saw that none of the three teachers were lying. He walked by the three teachers, and they didn't have the smell of phantom heart grass.

As long as the fantasy heart grass is carried on the body, it will leave a smell. Even if the fantasy heart grass you carry is thrown away, the smell will continue to last for about ten days.

"These three teachers are fine!" Xu Yuntian said to Principal Fang.

"That's the last one, it's an outsider who poisoned the teacher's office." Principal Fang frowned.

Xu Yuntian nodded and said, "Yes, there is a camera in the corridor. Immediately call out the camera to see who has entered this teacher's office before the teacher was poisoned?"

Principal Fang nodded and said, "Okay, then follow me to the monitoring room to check."

Xu Yuntian followed President Fang, Director Cai and others to the monitoring room of Blue and White University, and Xu Yuntian checked the surveillance video.

A moment later, he found that before the teacher was poisoned, a total of three people entered the teacher's office, namely the cleaner, a student, and a teacher.

Xu Yuntian saw at a glance that the cleaner had something wrong with her eyes because she had something wrong with her eyes and her eyes were full of anger.

"Principal Fang, who is this cleaner?" Xu Yuntian asked, pointing to the cleaner on the video.

President Fang looked at the cleaner. He knew him. There were more than a dozen cleaners in Blue and White University, and he didn't care about these things at all.

Director Cai, who was standing beside him, saw the cleaner's appearance and said in surprise: "Oh! Wang Guiqin! Why is she here!"

"Director Cai, do you know this cleaner?" Principal Fang looked at Director Cai and said.

Director Cai nodded hurriedly and said, "Principal Fang, I know this cleaner. She was fired a few days ago. Unexpectedly, she appeared in the teacher's office!"

"What! This cleaner was fired!" Xu Yuntian said in surprise. He immediately realized that the problem appeared on the cleaner.

"Since Wang Guiqin has been fired, why did she come to the teacher's office?" Principal Fang looked at Director Cai and said in confusion.

Director Cai shook his head and said, "I don't know either! She has been fired for three days, so there is no reason to come to the teacher's office!"

"Director Cai, why was Wang Guiqin fired?" Xu Yuntian looked at Director Cai and said.

"Teacher Liu reported that Wang Guiqin took the school mop home privately, and I fired Wang Guiqin." Director Cai looked at Principal Fang and said.

Before Principal Fang could speak, Xu Yuntian looked at Director Cai and said, "Before you fired Wang Guiqin, did you verify that she took the school mop home privately?"

Director Cai shook his head and said, "I didn't verify..."

"Uh! Director Cai, if you didn't verify the truth or falsehood, you would fire the cleaner. You're confused!" Principal Fang said to Director Cai.

Director Cai's forehead was sweating and he hurriedly explained: "I, I drank some wine at that time, and I was impulsive and didn't think so much."

"It seems that the cleaner Wang Guiqin was framed. After she was fired, she felt resentful and retaliated against the teacher." Principal Fang inferred.

Xu Yuntian thought for a while, looked at the teachers and said, "Who is Teacher Liu?"

"Teacher Liu, stand up!" Director Cai looked at Teacher Liu and said.

A man in his fifties walked out, slightly bald, wearing a suit and glasses, looking very gentle.

Teacher Liu was very nervous, his feet were trembling slightly, and he lowered his head, and he felt very guilty at first glance.

"What's going on with the cleaner Wang Guiqin?" Principal Fang looked at Teacher Liu and said.

"I, I, I saw Wang Guiqin leaving the school gate with a mop, so I told Director Cai about this." Teacher Liu stuttered.

Xu Yuntian could see at a glance that Teacher Liu was lying and sneered: "Teacher Liu, your lying is too obvious! Tell the truth! Otherwise you will be in jail!"

"I, I didn't tell lies, I was telling the truth." Teacher Liu argued.

"Haha! The quibbling is so pale and powerless, and it seems that you feel guilty! It seems that you want to go to jail!"

"Don't think that if you don't tell the truth, we won't know the truth. As long as we find Wang Guiqin, we will know the truth!" Xu Yuntian looked at Teacher Liu and said coldly.

Teacher Liu could no longer hold back. He suddenly knelt down at Principal Fang and cried, "Principal Fang, I was wrong. I was confused for a moment. I was framed by Wang Guiqin. In fact, she didn't bring the mop home..."

"Uh! Teacher Liu, why did you frame Wang Guiqin? Do you have a grudge against her?" Principal Fang looked at Teacher Liu and said in confusion.

"I, I had a quarrel with her and offended her." Teacher Liu explained.

"Hehe! You are also lying! You must be trying to attack Wang Guiqin, and you are molesting her. She rejected her. You are dissatisfied and framed her, right?" Xu Yuntian looked at Teacher Liu and sneered.

Teacher Liu looked at Xu Yuntian with shock and said, "How do you know!"

"Hehe! Men and women have grudges, but it's nothing more than love and money!" Xu Yuntian said with a smile.
Chapter completed!