Hhhhhhmmmmm.  I think the cops would get a bit sus if I took one of those out of the car boot on North Tce adjacent to the Adelaide Casino, & the street lights started dimming each time the reflector/deflector pointed at them.
But a good thought though.[bigrolf]
That reminds me of a supposedly true story from the UK some years back.  You may have seen it 3T.
A cop fiddling with his RADAR Gun on the roadside pointed it at a low flying Phantom Jet to check it's speed.
Apparently it has Defensive Measures on board & reflected the energy back to the cop's gun.  Thing was supposed to have exploded in his hands.
A good yarn if it was true but you may have seen summat about it in the media years ago?  
EDIT.
 Checking online I couldn't find that one but this story  has been around for yonks.  Maybe I got it ballsed up? 
Did a Police Radar Gun Almost Cause a Missile Launch?