1. Criminal investigation: Criminal investigation is an applied science to study the laws and characteristics of criminal activities and the strategies and methods to expose, prevent and confirm crimes;
2. Material evidence technology: Material evidence technology is a subject that studies the basic theories and methods of material evidence technology. Its purpose is to study how to apply the existing science and technology to solve various special problems related to material evidence in litigation under the guidance of the basic theory of material evidence technology, and to provide reliable basis for fair handling of cases.