"But everyone should have felt it; our suspicion of him is gradually deepening."
"The next step is to slowly transform this suspicion into a solid chain of evidence — moving him from 'suspect' to 'murderer', and this requires support from critical trace evidence."
Mr. Chen spoke calmly, but the pressure on his shoulders was not light.
In Mr. Chen's many years of experience, the more brutal and fierce the crime, the more likely it is to leave behind a wealth of biological traces or physical evidence;
In contrast, in cases like this one, where the killer uses a simple and direct method to inflict a fatal wound and then quickly leaves, there are far fewer interaction traces left at the scene — a single fatal stab, a clear wound, but lacking the hair, skin debris, fibers, and other trace evidence that might result from tearing, fighting, or prolonged contact.
