[conservatism_IS_compassion]

Radar?

What frequency would it take to resolve a bullet?

[LibWhacker]

Sound based. It would triangulate on the initial bang. It also traced out the flight path of the bullet in flight, real-time. Don't ask me how it was able to do that! Snipers, assassins, etc., are going to have much shorter combat life expectancies in the future, that's for sure.