Dao Zhi Yong was right. This was the only explanation, otherwise, Dao Zhi Yong couldn't have possibly murdered someone. Liu Yu Ning suddenly thought of something and continued to ask, "Then you never knew where your gun was? Criminal investigators aren't allowed to be without their firearms for 24 hours, are they..."
"I was asleep then. I don't even know if the gun was still with me. If Su Ya Xin were here, she might have seen. She went home earlier due to something urgent."
"Sigh, I bet you often slack off in the document examination room when you have nothing to do."
I said with a hint of reproach, but there was no time to blame him now. We had to find evidence that the murderer wasn't Dao Zhi Yong, otherwise, this would be very disadvantageous for him.
After a few words of comfort, we told Dao Zhi Yong not to be too tense for now. Then the two of us left the detention room and returned to the Punishment Team office. He Xin saw us coming out and asked about the situation. I said Dao Zhi Yong was relatively calm for the moment, but we needed to quickly find evidence to clear his name. So, everyone started working in the document examination room.
There was also surveillance here. I cross-referenced the footage from the hallway outside Director Ma's office and found that the crime occurred around 10:30 PM. If we could find footage of Dao Zhi Yong in the document examination room around the same time, it would prove that another Dao Zhi Yong committed the murder.
Fortunately, the surveillance in the document examination room was fine. We clearly saw that Dao Zhi Yong was in the document examination room at 10:30 PM and hadn't moved at all. That guy had been sleeping the entire time since 9 PM.
"That's good. At least now we have evidence that Dao Zhi Yong was in the document examination room at the time of the crime. No matter how the other him committed the murder, there's an explanation. Also, let's examine Director Ma's office. Did he leave any other traces there, like footprints or fingerprints?"
As I spoke, everyone followed me to Director Ma's office. After putting on shoe covers, rubber gloves, and head coverings, we entered with our forensic kits and started working.
We slowly searched from the main door to the desk. The crime scene likely had its bullet casings removed by the previous forensic investigators. There were bullet holes on the right wall, and based on the direction, the fake Dao Zhi Yong must have fired from the left. I hadn't examined Director Ma's body yet, so I'd have to go back and do that myself.
Director Ma's desk was very neat. There was a family photo on it, and also his favorite tea bags. I remembered Director Ma had a long-standing habit of brewing a pot of oolong tea every day. According to him, he couldn't focus on his work without drinking this tea.
The tea bags were still there, but he could no longer drink them. We tidied up, bagged everything we could collect as evidence, and then I went to the window. While examining the windowsill, I found some traces. Using a multi-spectrum light source and a chemical test with tetramethylbenzidine, a blue-green blood reaction appeared on the windowsill. Based on the angle, Director Ma's blood must have splattered here. If it wasn't Director Ma's, then the murderer must have been injured.
I had people extract fifteen blood samples from here. They would all need to be tested separately to determine their identity. If none of them belonged to Director Ma, then it would be even more valuable for our investigation.
After extraction, the forensic team went to work. I then sprinkled some yellow wine and seaweed ash and conducted a secondary examination of Director Ma's entire office. This time, I found two sets of footprints. The first set was outside the desk, and the second set was near Director Ma's seat. It was clear that one set belonged to the killer and the other to Director Ma.
I looked through Director Ma's desk and saw that the documents were case files, likely cases he was currently handling. I hadn't paid much attention to their content at first, as someone in his position would surely be dealing with many cases, including numerous public complaint cases. I flipped through them, most of which were about someone reporting another person, or recent murder, robbery, or theft cases. However, one case file caught my attention. Eight years ago, Director Ma personally apprehended Cao Xiang Yang for arms dealing. I didn't expect this guy to reappear. Director Ma had been quite agitated about this case recently. I could tell this from the number of cigarettes in his ashtray and the crumpled folds on the case file from repeated handling. After all, Cao Xiang Yang was a troublesome individual. It was unexpected that he was released from prison so soon. Based on his situation back then, he shouldn't have been released so quickly, perhaps he behaved well in prison.
According to China's Criminal Law, buying and selling firearms constitutes the crime of illegal sale and purchase of guns and ammunition, punishable by imprisonment of not less than three years but not more than ten years. If the circumstances are serious, the penalty is imprisonment of not less than ten years, life imprisonment, or death. For corporate crimes, the directly responsible personnel will be punished, and the corporation will be fined.
Cao Xiang Yang? Could he be related to Cao You Qin and Cao Xiang Chen? Or was it just a coincidence?
Xiao Ling was also surprised when she saw the name. "Oh my god, has the Cao family not perished yet?"
"He Xin, investigate if this Cao Xiang Yang has any connection with Cao Xiang Chen!" I instructed. He Xin immediately set to work. This time, because Dao Zhi Yong was in trouble and she didn't have anything else to handle, she had been following us for the scene investigation. After He Xin left, I continued to flip through the case files. The rest of them were trivial cases, so I took away the one about Cao Xiang Yang. This guy had reappeared recently, but this time he wasn't selling weapons, but flammable and explosive materials. Before Director Ma's incident, there had already been several explosion and fire incidents on high-speed trains and trains.
Of course, those were definitely not accidents, but man-made. According to Director Ma's investigation, someone had deliberately brought hidden flammable materials onto the transportation. Theoretically, these items would be easily detected by security personnel, but the criminals had somehow managed to evade security checks using unknown methods. I hadn't been involved in this case. It was estimated that Director Ma had been handling it all by himself recently. He probably felt that since Cao Xiang Yang was someone he had apprehended before, he should handle this case himself and not bother others. However, he was killed before he could investigate further. Director Ma would never have the chance to investigate this case again.
I wondered if this case had anything to do with his death. Could Cao Xiang Yang have sent people to do it?