As soon as the words were spoken, everyone else nodded in agreement.
"This should be the breakthrough in our next investigation."
Mr. Ma looked at Li Jian, who also nodded firmly.
Then Mr. Ma calmly arranged, "The next task will proceed from these aspects."
"First, conduct a trace evidence test on the set of keys in Jiang An's hand to determine if it's carbon. This will help us judge whether the killer used this key to enter the scene. If the killer brought charcoal onto the scene, it would make sense that carbon particles were left on the key."
"Second, investigate the first person who entered the scene after the crime. Ask them to recall the initial appearance of the scene, especially the condition of the doors and windows, the position of the keys, and the arrangement inside. This information is crucial to our investigation."
