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Forensic sciences - Methods for lifting two-dimensional footprint by using gelatin lifter
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Basic data
| Standard ID | GA/T 2186-2024 (GA/T2186-2024) |
| Description (Translated English) | Forensic sciences - Methods for lifting two-dimensional footprint by using gelatin lifter |
| Sector / Industry | Public Security (Police) Industry Standard (Recommended) |
| Classification of Chinese Standard | A92 |
| Classification of International Standard | 07.140 |
| Word Count Estimation | 6,663 |
| Date of Issue | 2024-11-29 |
| Date of Implementation | 2025-05-01 |
| Issuing agency(ies) | Ministry of Public Security |
| Summary | This standard specifies the equipment, ambient temperature requirements, operating procedures and precautions for the forensic science planar footprint gelatin film extraction method. This standard is applicable to the extraction of dust, sweat, water stains and blood footprints after chemical treatment on flat, curved and irregular surface objects. |
GA/T 2186-2024: Forensic sciences - Methods for lifting two-dimensional footprint by using gelatin lifter
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 07.140
CCSA92
Public Security Industry Standard of the People's Republic of China
Forensic Science Gelatin Extraction Method for Flat Footprints
by using gelatin lifter
The Ministry of Public Security of the People's Republic of China issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
Please note that some of the contents of this document may involve patents.
The institution does not bear responsibility for identifying patents.
This document was submitted by the Criminal Investigation Bureau of the Ministry of Public Security.
This document is under the jurisdiction of the National Technical Committee on Criminal Technology Standardization (SAC/TC179).
The drafting units of this document. Tianjin Municipal Public Security Bureau Physical Evidence Identification Center, Ministry of Public Security Identification Center, and Beijing Public Security Judicial Identification Center.
The main drafters of this document are. Liu Yiwen, Wang Yuan, Jin Yifeng, Lin Min, Yang Jiwei, Bai Yanping, Jiang Xuemei, Liu Huan, Ye Fangjian, Tian Rui,
Wang Guodong, Liu Jin, and Wu Hao.
Forensic Science Gelatin Extraction Method for Flat Footprints
1 Scope
This document specifies the equipment, ambient temperature requirements, operating procedures and precautions for the forensic science flat footprint gelatin film extraction method.
This file is suitable for extracting dust, sweat, water stains and blood footprints after chemical treatment on flat, curved and irregular surface objects.
2 Normative references
This document has no normative references.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
gelatin lifter
It is composed of a gelatin layer, a white rubber base layer, and a transparent polyester protective film layer. The film layer is a soft sheet-like material that can be peeled off.
Note. Gelatin sheet is a composite material, which can be divided into black gelatin sheet, white gelatin sheet, transparent gelatin sheet, etc. according to color.
4 Principle
The low viscosity of gelatin film can effectively pick up barefoot footprints, dust shoe prints, and trace biological evidence.
(including soft and hard) traces on the object. Using its strong adsorption, it can adsorb blood, ink, ink, printing oil and other substances after dyeing.
The film has a certain thickness. The thicker gelatin layer is less likely to produce bubbles. It can extract footprints from rough surfaces with dust particles to ensure that the footprints are complete.
Deformation.
5 Equipment and ambient temperature requirements
5.1 Equipment
The equipment should include gelatin film, footprint survey light source, electrostatic adsorption instrument, photographic equipment, protective equipment, scanning equipment, footprint scale, roller
Waiting for rounds.
5.2 Ambient temperature
The ambient temperature should be -15°C~40°C, 15°C~20°C is optimal.
6 Operation process
6.1 Preparation
6.1.1 The person extracting the samples should wear personal protective equipment such as gloves, head covers, masks, and shoe covers.
6.1.2 Use footprint detection light source, electrostatic adsorption device and other equipment to find footprints at the scene, determine the location, size, direction and extraction range of the footprints, and
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