What is the main task of criminal science and technology?

What you are talking about is criminal technology, which is criminal technology.

Criminal technology is an important part of China's public security work, and it is a major aimed at discovering, exposing and confirming various criminal activities. Modern criminal science and technology has a relatively complete system, which is divided into photography and camera technology, trace inspection technology, document (including handwriting) inspection technology, criminal physical and chemical inspection technology, forensic identification, DNA inspection, voiceprint recognition technology, odor recognition technology, psychological measurement (polygraph) technology, human appearance recognition technology, investigation and communication technology, criminal simulation portrait and so on. Criminal technology is also called forensic science and criminal investigation technology.

In a narrow sense, it refers to a special technology with the central task of solving the identification problem of the same person or tool, including criminal photography, trace inspection, document inspection, judicial ballistic inspection (bullet inspection), fingerprint registration, appearance identification and so on. In a broad sense, it also includes other technical tests that are not aimed at solving the same identification, such as forensic medicine, forensic chemistry, forensic physics and so on.

The main task of criminal photography is to photograph all kinds of traces and objects found in the crime scene and investigation, and show the trace characteristics invisible to the naked eye through special photography methods.

The main task of trace inspection is to find, fix and photograph various traces left by people or tools, including handprints, footprints, tooth marks, tool marks, vehicle marks, animal hoofprint and other material images, and how to identify people or things by the same method according to this phenomenon.

The main task of document inspection is to identify the writer of characters and symbols according to the handwriting, to identify whether the document is forged or altered, to display the smeared handwriting content, and to restore the torn and burned document.

The main task of judicial ballistic inspection is to find out the shooting situation, such as shooting distance and shooting direction. And identify the guns used when shooting according to the marks on the shooting warhead and the shooting shell.

The main task of fingerprint registration is to register the fingerprints of the arrested prisoners in a certain range, and store the registration card number for checking the criminal record and checking fingerprints on the spot (see criminal registration).

The main task of appearance recognition is to identify a person according to the criminal's appearance characteristics or personal photos stated by witnesses or victims.

Criminal technology should be distinguished from forensic science and material evidence identification technology.