Undercover investigation reveals little-known software tool used for tracking ordinary people

In the last of a three-part series about a software tool used to secretly track people, reporter Michael Montgomery explains what the company First Wap has been up to over the past 10 years. Its software tool runs on a vast trove of data that includes information about lots of regular people, but that data drops off in 2015. His reporting stems from a collaboration between Reveal, Lighthouse Reports and 12 other newsrooms around the globe.