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1. System background
Physical evidence is one of the evidences stipulated by the Criminal Procedure Law and an important evidence to prove a crime. It has objective reality, irreplaceability, and legality. Many of the physical evidence obtained from the crime scene was collected by investigators and technicians after working day and night, under extremely difficult and severe conditions, after careful search and extraction. Therefore, standards and requirements should be strengthened in the work, and modern information technology should be used to improve the quality of management work, realize the scientific management of evidence, make up for the shortcomings in the work, and improve work efficiency.
2. System composition
The Public Security Bureau’s physical evidence management system is managed byRFIDIt is composed of tags, reading and writing equipment, application systems, alarm systems, etc.
Three, the system process
● Acquisition layer: RFID tags, one-dimensional barcodes, handheld terminals, four-channel fixedReader,antenna.
● Communication layer: The material evidence label information collected by the reader can be transmitted to the background application system for analysis through the network. The communication interface of the transmission can be selected according to user needs, and RS232, RJ45, WIFI, etc. can be selected.
● Application layer: complete the processing of collected data, including physical evidence storage management, physical evidence storage management, alarms and other functions.
● Data integration layer: complete the interconnection with other systems in the enterprise to realize data sharing and transparency.
The hardware of the Public Security Bureau’s physical evidence management system is mainly composed of RFID tags, one-dimensional barcodes, fixed readers, handheld readers, and application systems. When the system is working, it is mainly based on handhelds. It scans the material evidence in the warehouse to quickly and accurately find the required material evidence. Combined with the fixed reader-writer to verify the inbound and outbound control of the material, the card issuer realizes the data entry combined with the application system to form a complete set of systems. The public security bureau’s physical evidence management system.
Four, system characteristics
◇ Digital management of physical evidence
● The application system can quickly query the information of the material evidence, and automatically upload the data of the material evidence in and out of the warehouse;
● The physical evidence is affixed with labels and one-dimensional barcodes, which can quickly scan the information and storage location of the physical evidence;
● The handheld device can display the material evidence information read to ensure the correctness of the material evidence taken out;
◇ High safety performance
● RFID tag combined with one-dimensional bar code to ensure complete identification of physical evidence information;
● Each electronic tag has a unique code, which can quickly identify the physical evidence and will not cause confusion due to code duplication;
● Prevent “entrainment” of material evidence that is not registered in the system from being mixed with the material evidence that is normally out of the warehouse and taken away;
● The hand-held machine is matched with the fixed reader to improve the accuracy of the system;
◇ Automatic data upload to improve work efficiency
● Automatic collection of inbound and outbound data to reduce human error;
● Improve the accuracy and reliability of physical evidence management;
● Reduce labor management costs;
◇ Easy to install and easy to expand
● Labels can be selected according to the actual situation;
● It can be easily expanded to increase the positioning function of valuable equipment, fixed assets and physical evidence;
● Combined with peripheral equipment, it can realize visual management and easy to expand.
Five, system topology diagram
Public Security Bureau’s Evidence Management System (above)
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