More than likely that conjectured capability is the yesteryear Predator. Seems tech may have received some upgrades: https://www.technologyreview.com/2019/06/

More than likely that conjectured capability is the yesteryear Predator. Seems tech may have received some upgrades: https://www.technologyreview.com/2019/06/27/238884/the-pentagon-has-a-laser-that-can-identify-people-from-a-distanceby-their-heartbeat/ https://www.technologyreview.com/2019/06/27/238884/the-penta... There was also a hot-air balloon program that would persist at stationary at high altitude and track all moving targets over a metropolitan area for up to a month without maintenance. The news article which said the project was called "Basilisk Stare", seems to have vanished now though from all search results. Edit: Maybe I'm misremembering and its actually Gorgon Stare. https://en.wikipedia.org/wiki/Gorgon_Stare https://en.wikipedia.org/wiki/Gorgon_Stare