The analysis of tire tracks, Lu Chuan had encountered while in school.
However, the course at that time was called vehicle trace analysis.
Tire tracks are a part of it, of course, also the most important part.
In the vast majority of crime scenes, there's always the presence of transport tools.
Take for example the body sinking case at Happy Reservoir, where the killer used an electric scooter to transport the body.
Or the recent case where Chen Yating killed Zhang Zixuan, after dealing with a portion of the body each day, Chen Yating would drive away from the hideout and return home.
In the car's trunk, Lu Chuan and others also detected trace amounts of blood and some small human tissue.
Compared to murder weapons like daggers and hammers, the target of a transport tool is larger and harder to hide.
Therefore, in many cases, tracing the murderer through the transport tools they use is a very important and common method.
