Obviously, this medicine bottle, which was specially supplied by the foreign military, completely confirmed the fact that there was a spy.
Since the medicine bottle appeared in Liu's house, the spy must be lurking here.
Then, who could it be?
The captain of Guoan swept his sharp eyes over the crowd, and his right index finger rhythmically tapped the gun in his palm.
The National Security Bureau has the Liu family's basic files.
Especially since Mr. Liu and Liu Zhenxing are both from the army.
Comrade Guoan, who was in charge of the archives, leaned over to his captain's ear and reminded him, "Liu Zhenxing and his wife are the only ones missing."
"Maybe he's inside." Upon hearing this, the two police officers cooperated and pointed to the closed bedroom door in front of them.
Liu Yuning shook his head. "My father and Aunt Yue have been sent to the military hospital for emergency treatment because of poisoning."
After saying that, he walked forward and opened the bedroom door, and sure enough, there was no one inside.
After Liu Yuning recounted what happened today to the National Security Bureau personnel, he continued, "The military hospital has the medical records, and I was the one who made the report. I don't need to lie."
The comrades from Guoan nodded, it was indeed reasonable.
It seems that the targets of the spy's operation this time are Liu Zhenxing and Yue Shan.
Liu Zhenxing used to be in the army, and Yue Shan worked in a research institute. Both of them had access to a lot of confidential information.
Liu Yuning continued, "Captain Zhou, the key to finding the spy lies in this medicine bottle. Let my sister-in-law explain this to you."
As soon as he finished speaking, Meng Zhen stepped forward and took over the conversation.
"I found the medicine bottle in the trash can after lunch. It was lying on top of the kitchen waste and was easily visible. This means the bottle must have been discarded after lunch."
"And from morning to lunch, there were only seven people at home. So," Meng Zhen paused, "the spy is most likely among the seven of us!"
As soon as these words were spoken, the scope immediately narrowed.
Everyone's eyes were on the Liu family. Who was the spy?
Yet at first glance, there's no clue at all.
Meng Zhen analyzed, "Since the medicine bottle was carried by the spy, he must have touched it. As long as we extract the fingerprints on the medicine bottle and compare them with the seven of us one by one, we can find the hidden spy!"
Emma, yes!
This statement immediately clarified everyone's thoughts.
The comrades from the National Security Bureau nodded in agreement. They had indeed heard of the concept of fingerprint comparison.
But, "How do I extract the fingerprints from this medicine bottle?"
Thinking of this problem, everyone was in trouble again.
Meng Zhen curled his lips and took out the transparent tape he had prepared long ago from his pocket, "Just use this!"
After saying that, she cut a small piece of tape with scissors, stuck it to her fingerprint, and pressed hard.
Press for half a minute and then tear it off.
Her fingerprints were clearly collected on the transparent tape!
"This is possible!" The comrades of Guoan suddenly realized it!
The two police officers were also amazed by what they saw. After returning, they must popularize this method in criminal investigation, which will definitely help solve the case.
Next, Meng Zhen followed the same method and collected the fingerprints of all ten of his fingers onto a piece of tape.
Seeing that she finished collecting fingerprints so quickly, Liu Yaoguo in the corner suddenly turned pale.
He questioned, "Since you picked up the bottle, your fingerprints must be on it. Aren't you just hitting yourself?"
Seeing her brother speak, Liu Yaomei chimed in, "Yeah, and what if you're a spy? And since you're so familiar with fingerprint extraction, who knows? You might have wiped your fingerprints off the bottle beforehand."
Others couldn't hear the guilt in the two people's words, but Meng Zhen was not like that.
She chuckled softly, her tone meaningful: "If you have the time, you should worry about how to explain the fingerprints of both of you being found on the medicine bottle!"
These words hit the nail on the head for the two siblings, and Liu Yaoguo was so nervous that his heart almost jumped out of his throat.
But he still had to be tough: "Humph, how is that possible? We are of good family background and grew up under the red flag! Don't try to accuse us of spies so easily!"
No matter how weak your heart is, your spirit cannot be weak.
Besides, if you throw the medicine bottle in the trash can, who knows if there will be fingerprints left on it?
Liu Yaoguo comforted himself and gradually calmed down.
The comrades from the National Security Bureau were listening to Meng Zhen talk about how to extract fingerprints from medicine bottles when they were suddenly interrupted by Liu Yaoguo and others. They were very unhappy.
Captain Zhou said, "Since you two can't be spies, why don't we take your fingerprints for comparison?"
Meng Zhen took advantage of the situation and quickly handed the tape to the comrades from the National Security Bureau.
Liu Yaoguo was stunned.
But if I refuse at this time, wouldn't it make me look even more guilty?
He had no choice but to pretend to be calm and stretched out his hands in cooperation.
"Hmph, just take it!"
Haha, you are still being stubborn. Let’s see how you can argue later!
Meng Zhen glanced at his sweaty palms, took out a dry towel he had prepared long ago, and handed it to Comrade Guoan: "Wait, wipe the sweat off his fingers first, otherwise the fingerprints will be unclear."
Comrade Guoan grabbed Liu Yaoguo's fingers, wiped them one by one with a towel, and then used tape to stick to his fingerprints.
Then the same method was used to take Liu Yaomei's fingerprints.
After successfully taking fingerprints, Meng Zhen continued to teach science.
She came prepared.
"Taking fingerprints from containers is more complicated and requires some tools."
Meng Zhen first took out a pair of disposable gloves and put them on, took out a bag of black graphite powder, and then carefully sprinkled the powder on the medicine bottle.
My dear, there is more to this chapter. Please click on the next page to continue reading. It will be even more exciting later!
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