super unscrupulous student

"Not yet. We found a strange stone and asked the angel to bring it back for testing. We will go there to open the lockbox in a while!" Zhuo Yifan nodded and explained.

"Stop chatting, let's go to the laboratory!" Angel anxiously pulled Zhuo Yifan up and ran to the laboratory on the third floor.

After arriving at the laboratory, Zhuo Yifan handed the stone to the angel, watched her throw the stone on a test bench, and started working in the cabinet beside her.After a long time, I found out something like a credit card machine.It's just that there is an extra long and thin probe for fingerprint scanning.This tool is currently used in the extraction of fingerprints on the scene of criminal cases.

"This is a fingerprint scanner. As long as the other party's fingerprints are left on those buttons, they can definitely be scanned! As long as they don't wipe the surface of the buttons after pressing them!" Angel explained.

"Then let's go there quickly!" Zhuo Yifan nodded and said.

Immediately Zhuo Yifan took the angel and prepared to leave.As soon as he got downstairs, he was stopped by Fenghuang and Wisteria.

"The two of us have nothing to do, or we will go with you to have a look, maybe we can help!" Fenghuang offered a suggestion without waiting for Zhuo Yifan to ask.

Zhuo Yifan pondered for a while, then nodded in agreement.Then he drove back to the previous basement with the three girls.

"Are you all here?" Xie Dongting looked a little surprised when Fenghuang and Wisteria followed Zhuo Yifan.

"They happened to have nothing to do, so I brought them here, maybe they can help!" Zhuo Yifan explained casually, and then asked: "After we left, nothing happened, right?"

"No. I'm the only one here, and I haven't noticed anyone approaching!" Xie Dongting nodded.

"Let me see if there are fingerprints left on those four buttons!" The angel went directly to the safe with a fingerprint scanner, cleaned out all the bottles and cans inside, and then used the scanner to scan the four buttons. Swipe over the buttons.

"Yes!" The angel suddenly shouted excitedly.

"Did you find that button?" Zhuo Yifan asked with a boost of energy.

"That's right, just like what you said, there is only one button with traces of pressing!" Angel nodded back.

"Then what are you waiting for, open it and have a look!" Zhuo Yifan said happily.

"Wait..." Xie Dongting suddenly called out.

"What's wrong?" Zhuo Yifan couldn't help frowning upon hearing this.

"What if this is also a trap set by the Long family? It relies on fingerprints to find the button, and I think the other party can also figure it out. They didn't deliberately leave such a loophole for us, and then let us press the wrong button?" Xie Dongting asked hesitantly.

"I know what you're worried about. What I'm talking about is that only one button has a trace of pressing on it, not fingerprints!" Angel explained with some dissatisfaction.

"What do you mean?" Xie Dongting asked in a daze.

"Fingerprints have been left on these four buttons. Obviously, the other party also thought of fingerprint recognition, so each button has fingerprints of different people. This is easy to do, no need to press Go down, just touch it with your fingers." Angel explained, pointing to the four buttons and continued: "But they ignored one point. Some of the chemicals placed outside the safe are volatile. There is a thin layer of grease accumulated on these buttons, which is difficult for ordinary people to find. I also saw the clues when I observed these fingerprints. There is only one button, and the protruding part around it is relatively clean, compared with the other three. The grease on each of them is thinner, and it is obviously scraped off during the process of pressing and bouncing."