As soon as the words fell, Jiang An placed the square ink cartridge and the fingerprint card on the small table in front of Liu Tie.
Then, he extended his right thumb and pressed it onto the white fingerprint card, saying, "See, it hasn't left any trace of mine."
The next second, he pressed his thumb into the black ink cartridge, then moved his finger and pressed his thumb onto the fingerprint card.
Instantly, a clear thumbprint appeared on the fingerprint card.
Jiang An said in a deep voice, "How is it? As long as my finger is stained with black carbon dust, it will leave an imprint on this fingerprint card."
"Now, you should realize that on that night, with carbon dust on your finger, you would leave marks on the key."
As soon as he finished speaking, Liu Tie's eyes widened, staring intently at Jiang An, his face full of terror.
Seeing Jiang An's maneuver, Li Jian, who was sitting next to him, was quite astonished.
He looked at Jiang An seriously, his mouth slightly open.
