From a professional perspective, footprint identification and analysis primarily targets three elements.
The imprinting object refers to the main subject that creates the footprints, such as a barefoot, a foot wearing a shoe, or a foot wearing a sock.
The imprinted object is the ground or other objects that carry the footprints.
The third critical factor is the force applied, which includes not only the body's gravity but also the muscular contraction force of the foot.
In the vast majority of cases, the type of footprint encountered is a shoeprint.
It's rare for suspects to not wear shoes, walking barefoot or only in socks at the crime scene freely.
Footprint identification that Lu Chuan has encountered is also related to shoeprint footprints.
Compared to barefoot prints or socked footprints, shoeprints have a distinct feature as the shape is strictly confined by the shoe's external form.
