Fitbit, one of the companies making wearable fitness trackers, has sold more than 20.8 million devices and has 9.5 million paid active users as of March 31, 2015, according to Mobilehealthnews.com. That's a lot of consumers using the device to track their physical activity, daily steps, and other vitals related to health and wellness (Fitbit has many integrations with other applications, enabling users to track calories, water intake, and other variables). Most of these users of tracking devices like Fitbit and Garmin may think the data on their activity belongs to them. However, they would be wrong (see our previous post, "The downside of wearable fitness technology").
In fact, not only do those companies own our data, but our own data can be used against us: to date there have been two criminal court cases where the prosecution used wearable device data to make their cases. The potential for courts and even third parties to use the data collected by fitness trackers against us could put a significant damper on this popular category of consumer devices.