Arriving at the forensics department, Peng Sijue told Chen Shi, "There were only two people's fingerprints on the Zhonghua cigarettes' packaging. Teacher Liu and Teacher Yan's fingerprint distributions were like this..." Peng Sijue showed him a simulated picture.

As a former smoker, Chen Shi saw that they were fingerprints left behind from dismantling the cigarette carton. He said, "Teacher Yan stole the cigarettes. Were his fingerprints on the trophy?"

"There are no fingerprints on the trophy. It had been wiped clean, including the blood stains. If luminol wasn’t used, you wouldn’t have been able to discover the blood stains."

Chen Shi picked up the trophy on the table. Based on its structure, you’d have to hold it up with both hands or grasp the top with one hand. Chen...