> how radar (and lasers) are weaponised by police to detect the speed of vehicles

How exactly is this process "weaponisation"?

If your radar gun is strong enough, it will push the car forwards. Once the plasma and gaseous metals have dissipated you can then ticket the driver for speeding even if they weren't speeding before you measured their speed.

I guess when I visit my doctor and he weighs me he's weaponizing gravity as well.

Once the police are done with it, it's a radar gun, clearly a weapon. Actually it isn't very pleasant to a uniformed police officer pointing one at you, at least in my opinion.