I'm fairly certain, but you could be right too. It was about 300 metres down the road from where I was buying some lunch. I detected Ka from aways' off, and was looking for the patrol car when saw the vehicle which had been waved down, with an officer leaning in the window, but no patrol car visible anywhere - and figured something sneaky was going on. I bought my food, hopped back in the car, and no Ka until about 100 m up the road when the other pair stepped out from between some trees on the opposite side of the road (from the first cop I saw but the same side as me), one holding handheld device which was pointed at me and the R7 howled with Ka. As I drove past the one holding the 'gun' (whatever we think it might have been) swung it to keep it directly pointed at me as I drove by eating my chips - don't judge my lunch choices lol.A handheld Ka gun? Are you positive? Or were you getting Ka from the cars not the gun. Perhaps the gun was Lidar and too close for your R7 to see the beam?
The reason I ask is that the last two OIA info sheets did not list Ka guns. there was something called a Stalker Acura, but whatever that is, it's not on the Stalker product list.
I can't rule out it all being a coincidence though, as you suggest there could have been an unseen car which flicked it's radar on at the same time as the second pair of officers targeted me with a lidar which I didn't detect, but the series of events as I perceived them seemed pretty convincing to me.
Interesting about the OIA results, sounds quite strange...