In 2018 ... the government was buying up reams of consumer data information scraped from cellphones, social media profiles, internet ad exchanges and other open sources " and deploying it for often-clandestine purposes like law enforcement and national security in the U.S. and abroad. The places you go, the websites you visit, the opinions you post " all collected and legally sold to federal agencies. The data is used in a wide variety of law enforcement, public safety, military and intelligence missions, depending on which agency is doing the acquiring. We've seen it used for everything from rounding up undocumented immigrants or detecting border tunnels. We've also seen data used for man hunting or identifying specific people in the vicinity of crimes or known criminal activity. And generally speaking, it's often used to identify patterns. It's often used to look for outliers or things that don't belong. So say you have a military facility, you could look for devices that appear suspicious that are lingering near that facility. Did you know that your car tires actually broadcast a wireless signal to the central computer of your car, telling it what the tire pressure is? It's there for perfectly legitimate safety reasons. Governments have ... figured out that the car tire is a proxy for the car. And if you just put little sensors somewhere or you run the right code on devices that you scatter around the world, then you can kind of track people with car tires.