I gave a quick glance in the mirrors to check for CHP and continued on.
And just how far back can you spot a Chippy in those mirrors, sir? I can spot them maybe 100 yards back. If I'm doin' 75, it's already too late. I'm counting on outrunning all the casual followers and avoiding radar and aircraft ahead. Can't see much at all in those mirrors.
If it's a car CHP, I look for the contrast between the body (black) and the roof (white) which is prolly good for a quarter mile worth of 'mirror'. If it's a MC CHP, that's tougher... Again, I look for the contrast - helmet color (usually white or gold) and compare that to the headlight configuration (the RT's is quite distinct), so if I see a light colored helmet and a RT headlight, I'm off the gas pronto until I can confirm otherwise. This is usually good for 1/8 to 1/4 mile depending on light conditions.
I've never seen a radar plane, so I can't comment on that issue.