maybe he blocked the signal..
my bro has teh same radar and everytime I drive with him, it works when cops have their gaydars on...
that's a good detector, don't blame it
Cops can't block their radar signal.
It could have been the angle that he got you at, or it could have been that he didn't even use his gun, but rather "guessed."
They can pace you, or estimate your speed in addition to using their radar gun.
Does it say that he used radar on the ticket? If so, then he lied, or your detector didn't pick it up.
There are things called radar jammers, but they jam cops radars so that when they clock you, it doesn't display a correct speed. Cops can't jam their own radar guns.