A new study introduces ESauron, a proof-of-concept system designed to identify hidden spy cameras through analysis of electromagnetic radiation patterns. The researchers explain that all video capture devices process raw image data internally before transmitting or storing it, a step that occurs within embedded memory units. During this processing, memory operations generate electromagnetic emissions due to fluctuating electrical currents tied to clock signals and workload changes. When visual input shifts, processing demands spike, producing detectable surges in electromagnetic activity. By intentionally triggering scene changes and monitoring for these electromagnetic responses, ESauron can locate hidden cameras at distances up to 20 meters, even through obstacles. Testing across 50 camera models demonstrated full detection accuracy following four stimulation cycles, with consistent location precision. The system operates without requiring physical access or cooperation from the camera owner, offering a potential tool for privacy audits in private spaces. The findings were presented at a USENIX open access event, where associated research materials will be made publicly available post-event.