Wireless sensing technologies embedded in everyday devices can now detect our physiological signals, breathing, heartbeat, and even emotional states, without any physical contact or visible indication. While these capabilities promise revolutionary applications in healthcare and safety, they also enable unprecedented invisible surveillance. This talk explores the fundamental tension between technical capabilities and ethical boundaries in wireless physiological sensing.

I will first demonstrate how pervasive these sensing capabilities have become, showing that devices already in our homes and workplaces possess the hardware to extract health data from wireless signals. I will then present VitalHide, our system that enables users to obfuscate their vital signs from unauthorized sensors while preserving utility for legitimate applications. Finally, I will introduce our ongoing work using interactive simulations and Contextual Integrity to understand when wireless sensing violates social norms versus when it provides acceptable benefits. The talk will argue that as we stand at the threshold of ubiquitous physiological sensing, we need both technical privacy protections and ethical frameworks that evolve with these powerful but invisible technologies.