I encountered a LEO running KA in Ottawa last week-end. He was on the top of a bus only onramp shooting cars from behind. Fortunetly he was using constant on and I got reflection back from cars ahead that had already passed him.
I have a STI driver and emmune from electronic detection, but if you get hit from behind like that and brake hard, the LEO will know you are running a RD.
Off the gas, and gear down is my rule almost all of the time.