Aerial Surveillance Is Astonishingly Legal August 3, 2019 https://www.theatlantic.com/technol...ry-style-surveillance-air-often-legal/595063/
So is the US military. Because there's a surveillance exception for the Posse Comitatus Act. See "Pentagon testing mass surveillance balloons across the US" at https://www.theguardian.com/us-news/2019/aug/02/pentagon-balloons-surveillance-midwest