WiFi feels like plumbing. It’s boring, invisible, and trusted by default. But research from Karlsruhe Institute of Technology shows that ordinary WiFi signals can now identify people with near-perfect accuracy, even when they’re not carrying an active device. This isn’t science fiction or a reason to panic. It’s a signal that infrastructure we consider neutral can become surveillance without looking like it. For small businesses, the challenge isn’t the technology itself. WiFi, sensors, CCTV, door access, and meeting room systems can all be genuinely useful. The problem is treating them as operational kit rather than privacy decisions. Noel Bradford walks through the uncomfortable reality that clever dashboards, vendor promises, and boring boxes on the ceiling can quietly collect more data than anyone has thought through. The solution isn’t to rip access points off the wall. It’s to stop assuming that boring infrastructure is harmless infrastructure, and to ask the awkward governance questions before the router starts behaving like a camera.