I forget the name of the TV series but there was a great show where aliens had occupied earth and the drones were just completely lethal and unstoppable. It was

I forget the name of the TV series but there was a great show where aliens had occupied earth and the drones were just completely lethal and unstoppable. It was very realistic, the machines would just show up and instantly frag everyone in sight. The story was about a cop who ended up working for the alien occupiers, I wish I could remember the name of the show.