Sometime in March of this year, Jeannine Risley flew from Florida to Lancaster, Pennsylvania, staying overnight in her boss’s guest bedroom.
In the morning, she filed a police report, claiming that an unknown man had broken into her boss’s home and raped her at knifepoint.
During the investigation, the police found her Fitbit — a “wearable” fitness device that, strapped to your wrist, tracks your movements, heartbeat, quality of sleep, and other physical metrics — which, once examined, told a different story.

The Fitbit Force is displayed in the Fitbit booth at the 2014 International CES at the Las Vegas Convention Center on Jan. 7, 2014, in Las Vegas, Nev. Justin Sullivan/Getty Images