CNBC: As workplaces slowly reopen, tech companies smell a new multibillion-dollar opportunity: Helping businesses trace coronavirus

Chicago startup Proxfinity is selling a Covid-tracking product called the Rescue smart badge that was originally designed to help people network at large events. “We can provide highly specific information about person to person interaction, without depending on apps, phone, GPS or really requiring any personal details,” Proxfinity CEO Lisa Carrel said.