Yeah, left lane should always be moving. I'm usually going ~80 in the 65 in I-95 in the left lane. I wish cops would pull over idiots slowing down the left lane/passing lane. That said, on normal roads, I almost always go 5 over the limit. Traffic sucks down here, so it's not often I can even do that!this goes for every state.
I've had cops tell me they won't pull anyone over unless they are going more than 15 over the speed limit. I assume everyone is different.
I had a radar detector in high school and the two times I got pulled over with it, I just ripped it off the windshield quickly and threw it in my center console.