This has been bugging me for some time.
I never pick up a radar signal off a California Highway Patrol bike (BMW RT-Ps which use Stalker, so I've seen) while on the move.
Anyone know why, or do they just use their bikes and PACE? I've seen them pull some gray gun out of their saddle bags while they sit under the shadows of bridges, but I never get a hit off that either (Redline or 9500ix).
Around their cars, I pick up all sort of Ka signal stuff (be it leaky or not while they pull out of their compound yard).