We already have a system for that in the US. Just in the visible spectrum. https://www.cato.org/blog/judge-allows-warrantless-aerial-surveillance-over-baltimo

We already have a system for that in the US. Just in the visible spectrum. https://www.cato.org/blog/judge-allows-warrantless-aerial-surveillance-over-baltimore https://www.cato.org/blog/judge-allows-warrantless-aerial-su...