Professor Michael LeRoy was quoted in an April 10th article in The Atlantic regarding the use of wearable devices in the NBA, and concerns about privacy. 

Currently, the use of wearable devices in the NBA is heavily regulated by the league's new collective-bargaining agreement. The devices are prohibited entirely during games, and use in practice is strictly voluntary. The agreement states that data collected from a wearable worn at the request of the team "may be used for player health and performance purposes and Team on-court tactical and strategic purposes only." The data may not be used in player contract negotiations. 

Nevertheless, LeRoy and other experts have concerns about how the data will be used.

"It seems inherently geared to advantage the team," says Michael LeRoy, a professor of law at the University of Illinois. "When it’s not linked to performance and not actually linked to injury, just correlation, and these correlates really are going to affect [a team’s] offer, it’s hard to see where that data can be used to the advantage of a player."

Full article at TheAtlantic.com