it should be on dash cam and recorded on a lapel mic your conversation so if they didn't read you the rights then it should all be there and they can't charge you without your rights.

They do NOT have to show you the radar and they do NOT even have to show you the calibration...You would have to walk back to the car any ways to see it unless they got you with a laser GUN.

I've gotten out of radar tickets before because i knew more about how the technology(or lack of) worked than the officer.