American Policing Goes to the Supreme Court

"But technology has slightly changed since then. Elizabeth Joh, a University of California, Davis, law professor who studies policing and surveillance, told me most people don’t realize the data they create when using everyday devices could someday be used against them by law enforcement. In fact, they probably don’t know much about their data at all. “Number one, we’re not really aware most of the time how much information we’re providing to these third parties,” Joh said. “And number two, it’s really hard to think of that as a voluntary act, because frankly it’s impossible to live a normal life without providing this kind of locational information.”"