The CK-G640 employs multiple redundancy measures to ensure continuous operation and data protection:

• 1. Local Data Storage and Processing:The main cabinet contains substantial local storage (4G+128G configuration) that maintains complete operation records independently. All access events, inventory data, and audit trails are stored locally with battery-backed protection, ensuring no data loss during power interruptions. The system continues to function normally in offline mode, with all data syncing to cloud platforms once connectivity is restored.
• 2. Battery Backup System:An integrated UPS provides immediate power backup during main power failures, supporting several hours of continuous operation for critical functions including access control, evidence tracking, and audit logging. This ensures evidence remains secure and accessible even during extended power outages.
• 3. Manual Override Capabilities:Each compartment includes mechanical emergency unlock mechanisms that allow authorized personnel to access evidence using physical keys when electronic systems are unavailable. These manual accesses are still recorded in the local audit trail through mechanical sensors, maintaining the chain of custody documentation.

The system utilizes sophisticated RF management techniques to ensure accurate item identification:

• 1. Dedicated Scanning Zone Design:Rather than placing RFID readers in each compartment, the system employs a centralized high-precision reading area below the main display. This design ensures that only one item is presented to the RFID reader at a time, eliminating cross-talk between multiple tagged items and ensuring each tag is read individually with 99.98% accuracy.
• 2. Sequential Reading Protocol:The RFID system activates in precise sequences rather than continuous scanning mode. When an evidence item is presented to the scanning zone, the system initiates a focused reading cycle that captures the tag data without interference from other items in nearby compartments or storage areas.
• 3. Signal Power Management:The UHF RFID readers dynamically adjust transmission power based on the specific reading zone requirements. This controlled power output provides sufficient energy to activate the presented tag while minimizing signal propagation to other areas, effectively creating an electromagnetic containment field around the scanning zone.

The system maintains an immutable chain of custody through comprehensive tracking:

• 1. Multi-Factor Authentication Linking:Each evidence access requires authentication through the dual-camera facial recognition and card reader system. This creates a verified link between the specific evidence item, the authorized personnel, and the exact timestamp of each handling event. The system captures and stores biometric data alongside RFID evidence identifiers for complete accountability.
• 2. Continuous Status Monitoring:Evidence items remain actively monitored even when removed from their assigned compartments. The system tracks which evidence is checked out, by whom, and for what duration. If evidence is not returned within predefined time parameters, the system automatically generates alerts to supervisors and creates exception reports.
• 3. Digital Signature and Audit Trail:Every evidence transfer generates a digital signature that includes the RFID tag data, personnel authentication credentials, timestamp, and purpose of access. This creates an auditable trail that meets legal standards for evidence handling, with all records cryptographically secured against tampering. The system can generate comprehensive chain-of-custody reports on demand for legal proceedings.