Traces are a crucial area of study in forensic science.
Although in solving cases, it's a common thing to do.
But, in the eyes of true trace experts, there's more than just blood stains, footprints, fingerprints, movement of objects, etc.
A true trace expert links these traces to the psychology of the person who left them.
The statement by Qin Fei, "He turned back," was exactly the result Chen Xiao deduced through those traces.
However, just the statement "He turned back" isn't the real focus.
Chen Xiao pointed to the last footprint left by the murderer at the crime scene and said, "Look at the trace in this circle, can you tell what it suggests?"
"He turned back, and more than once, there's a high probability he stood here for a long time," Qin Fei gave his opinion.
Chen Xiao nodded, but before he could say anything, Qin Fei already thought of a previous situation:
"Could it be that he picked up Ye Jun's phone at this moment and sent the alarm text?"
