Yes, it's true. Some of the ultralytes have a special feature that get rid of the cosine effect totally, so if you think you'll be safe by having those extra miles shaved off from a high angle overpass shot you're not with LTI guns.
How does it work?
First, the officer will plug in a distance reading into the gun. For example, if he was on a highway overpass he'd shoot at the ground directly below him. He plugs this number into the software and now the gun knows he's 20 feet above the ground, making the algorythm add miles to the original cosined speed.
Pretty cool huh if you're a police officer. Bad for us.
Highway overpass shots are a real threat. Unless your jammer has a curved lens on it it's highly unlikely it'll protect you.