Most security focuses on networks and endpoints. Very little attention is given to what devices emit into the physical environment. This isn’t a dormant risk. It’s an unaddressed one. In March 2026, U.S. lawmakers formally requested a renewed investigation into TEMPEST-related threats, citing: • Lack of public awareness • Absence of modern regulatory requirements for consumer devices • Potential exploitation by criminals, private investigators, and non-state actors Image 1: Extract from Congressional letter (March 4, 2026) describing TEMPEST as a “serious national security threat”. The request highlights a critical point: The U.S. government has not conducted a follow-up review of this threat since 1986, despite the risk being known for over 80 years.…