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GA/T 1681-2019: Forensic sciences - Technical specifications for examination of convex bit key duplicated marks
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GA/T 1681-2019 | English | 139 |
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Forensic sciences - Technical specifications for examination of convex bit key duplicated marks
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GA/T 1681-2019
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Basic data | Standard ID | GA/T 1681-2019 (GA/T1681-2019) | | Description (Translated English) | Forensic sciences - Technical specifications for examination of convex bit key duplicated marks | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 6,669 | | Date of Issue | 2019 | | Date of Implementation | 2019-12-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1681-2019: Forensic sciences - Technical specifications for examination of convex bit key duplicated marks
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Forensic sciences - Technical specifications for examination of convex bit key duplicated marks
ICS 13.310
A92
Public Safety Industry Standard of the People's Republic of China
Forensic science concave tooth key with additional trace inspection
specifications
Published on October 14,.2019
2019-12-01 Implementation
Issued by the Ministry of Public Security of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some content of this document may involve patents. The issuer of this document does not assume responsibility for identifying these patents.
This standard was proposed by the National Criminal Technology Standardization Technical Committee Trace Inspection Sub-Committee (SAC/TC179/SC9) and
Be in charge.
This standard was drafted by. Physical Evidence Appraisal Center of the Ministry of Public Security.
The main drafters of this standard. Cui Jia, Bai Yanping, Jin Yifeng, Lin Min, Ye Fangjian, Ban Maosen, Jiang Xuemei, Liu Weiping.
Forensic science concave tooth key with additional trace inspection
specifications
1 Scope
This standard stipulates the method principle, distribution characteristics, and inspection methods for adding traces on the concave tooth keys equipped with mechanical locks in the field of forensic science.
Content, notes and appraisal opinions.
This standard is applicable to the inspection and identification of additional traces on concave tooth keys equipped with mechanical locks in the field of forensic science.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GA/T 929-2011 Forensic Science Examination Technical Specifications for Addition Marks on Splined Keys
3 Terminology
The terms and definitions defined in GA/T 929-2011 and the following apply to this document.
3.1
Concave tooth key
The tooth flower is a key distributed in the concave pits on the two large surfaces of the key shaft.
4 Method principle
In the process of adding a concave tooth key with a key copying machine, it will leave regular marks on the original key, that is, the template key tooth surface, and
The shape, position, line direction and arrangement relationship of the use marks formed by the key in normal use are different.
Features to determine whether a key has been added as a template key with a key duplicating machine.
5 Distribution characteristics of common distribution traces
5.1 At the bottom, side or edge of the dimple, there are scratch marks and dot-shaped imprint marks which are different from the processing marks.
5.2 There are dot-shaped or band-shaped pinch marks on the two small sides of the key.
6 Equipment and environmental conditions
6.1 Equipment
Auxiliary light source, stereo microscope with matching camera device, and digital camera with optical zoom function should be selected.
6.2 Environmental conditions
6.2.1 The laboratory environment should have conditions for shading, dehumidification, and dust prevention.
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