""I've just thought of something," the King added, and proposed implanting detainees with an electronic chip containing information about them and allowing their movements to be tracked with Bluetooth. This was done with horses and falcons, the King said. Brennan replied, "horses don,t have good lawyers," and that such a proposal would face legal hurdles in the U.S., but agreed that keeping track of detainees was an extremely important issue that he would review with appropriate officials when he returned to the United
States."