I'm not a LEO, Ex-LEO or even thinking of becoming a LEO.
Were there any witnesses that hung around for the LEO to take statements or provide their contact info. to vouch for what happened? If not, if it's a side-to-side crash (not a rear end collision) then I see it as his word against yours and you both share the responsibility. If a witness saw him move left back to his lane and then right (hitting you) then he is 100% at fault as he intentionally hit you to get some money out of you/your insurance company. My 2 cents.
On the positive side it wasn't in your Camaro.