C78 (2/2)

”Up till now, the situation in this case is still unclear. The culprit behind the poison is a link, the senna leaf was stolen from the school's medicinal material bank, the thief is someone else, we cannot reveal ourselves.” Lin Rong looked at Chen Hui and answered: ”That's why I wanted Management Head Zhang to teach you how to extract a fingerprint for yourself.”

”Can I?” Chen Hui asked with uncertainty.

Zhang Cheng laughed and said, ”There are a lot of ways to extract a fingerprint, such as powder, magnetic powder, laser, and many other chemical methods, and there are also a lot of different methods. Captain Lin had already told me about the situation previously, the suspect would enter the medicinal material bank through dismantling the anti-theft window, and his fingerprint would be left on the metal and glass.

Zhang Cheng was right, the powder method was the easiest method to extract a fingerprint. Choose a powder with a large color contrast and sprinkle it on the surface of the item to extract the full fingerprint.

However, simplicity often meant the premise was enough. The powder method could only extract fingerprints from non-absorbent items, such as metal, glass, and tiles.

”Is it really that simple?” Chen Hui still did not believe him, and said: ”It's not that I'm afraid of taking responsibility, but that I'm worried that I'm not professional enough, and will affect the resolution of the case!”

”It's really simple.” Zhang Cheng said, ”I guarantee that you will learn it as soon as you learn it!”

Chen Hui nodded his head, and did not say anymore, and followed Zhang Cheng to learn how to use the powder method to retrieve a fingerprint.

It was indeed very simple, had learnt it after Zhang Cheng taught him once, but after learning it, Chen Hui still asked him about the things to take note of.

Zhang Cheng naturally spoke everything he knew.

”If you have enough time, you can even take the footprints from the medicinal material bank!” After Zhang Cheng finished speaking, he said to Chen Hui: ”Although after taking out the fingerprint, the chain of evidence can be said to have formed, but adding another layer of evidence will still make the chain more complete, and will be of great help in solving the case.”

”Alright, I understand!” Chen Hui nodded and agreed.

Zhang Cheng said, ”I'll wait here tonight. If you retrieve your fingerprint, I'll bring it back to the team for comparison!”

”I may not be able to get my fingerprints until late.” Chen Hui said: ”There are a lot of people in the school, it's only late at night when it's quiet that I won't be discovered.”

”It's fine. In our line of work, staying up late is a very common thing.” Zhang Cheng said with a smile.

”Then I'll be leaving first. I need to ask Lee Jin for the key, I can't just go through the window and enter medicinal material bank like a suspect.” Chen Hui said with a smile.

Lin Rong made Zhang Cheng stay in her office to wait. She sent Chen Hui out of the squad and directly drove him to Lee Jin's home.

The statement that Lee Jin made had his detailed information, including his home address, phone number and the like. This saved Chen Hui a lot of trouble, so he did not need to ask Former Principal Chen Hong for his number.

Lee Jin received the phone call from Lin Rong and went downstairs early to wait outside the small district. When Lin Rong and Chen Hui appeared, he immediately gave the medicinal material bank key to Chen Hui.

”I'll return the key to you tomorrow.” Chen Hui said.