Laser scatter is *very* rare. That's one narrow beam. You're really only going to pick up scatter if the cop happens to be waving the gun around with the transmitter on.Not nessa-celery... I've had the laser warning go off and it's saved me, but you have to be behind or beside someone else and be luckey enough to not be the target. But other than that, you're screwed.
Really, the only safe answer is "don't speed". Or maybe V1 will stop resting on their laurels and build a new detector with bumper *and* roof/windshield mounted receivers.