Non-pollution duplex extracting method for scene fingerprints and DNA thereof

Abstract

The invention relates to a police investigation method, in particular to a non-pollution duplex extracting method for scene fingerprints and DNA of the scene fingerprints. The method comprises the following steps: S1, carrying out brushing display on the fingerprints by adopting a disinfected and inactivated disposable fingerprint magnetic powder brush and disinfected and inactivated magnetic powder; S2, collecting the information of the scene fingerprints; and S3, extracting DNA information of the scene fingerprints. According to the method provided by the invention, the disposable fingerprint magnetic powder brush and the disinfected and inactivated magnetic powder are adopted for carrying out brushing display on the fingerprints, the disposable fingerprint magnetic powder brush and themagnetic powder are subjected to disinfection and inactivation, do not carry biological DNA information, and are not recycled after use, so that the pollution and damage caused to DNA in the scene fingerprints by the repeatedly used brush and magnetic powder are prevented, and investigation personnel can efficiently and rapidly acquire the identity information of suspects.

Description

technical field [0001] The invention relates to a police inspection method, in particular to a double extraction method of on-site fingerprints and DNA pollution-free. Background technique [0002] In the investigation of criminal cases, in order to confirm the identity of the criminal suspect as soon as possible, it is necessary to test the fingerprints and DNA information on the scene. At this stage, there are mainly three ways to obtain fingerprints: 1. Physical manifestation method. Although this method will not damage the DNA information on the scene, it needs to use high-end large optical instruments to collect fingerprint information, which is inconvenient to carry to the crime scene. However, the fingerprints at most crime scenes cannot be transferred to the laboratory for physical visualization, and the cost of equipment is high, and the penetration rate of grassroots investigators is low; 2. The chemical visualization method, which uses chemical reagents to display...

AI Technical Summary

Problems solved by technology

At this stage, there are mainly three ways to obtain fingerprints: 1. Physical manifestation method. Although this method will not damage the DNA information on the scene, it needs to use high-end large optical instruments to collect fingerprint information, which is inconvenient to carry to the crime scene. However, the fingerprints at most crime scenes cannot be transferred to the laboratory for physical visualization, and the cost of equipment is high, and the penetration rate of grassroots investigators is low; 2. The chemical visualization method, which uses chemical reagents to display fingerprint information at the scene, and at the same time Destroy the DNA information carried by fingerprints at the scene; 3. Magnetic powder brushing method, this method has the highest penetration rate in grassroots police officers. After brushing fingerprint information, the magnetic powder is recovered and the brush is reused. It is easy to carry the DNA information of people who are not on the scene and destroy the scene. DNA information carried by fingerprints

Therefore, the dual extraction of fingerprints and DNA information at the crime scene is still not possible at this stage

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