Happened to me a few years ago.
Got the letter in the mail about 2 weeks later telling me 1 would loose license for 12 months, took em to court which took another 8 months and they changed their 'guesstamation' and let me off with a lesser loss.
I was speeding and I and they knew it, but they couldnt prove exactly how fast I was going.
Was there only 1 cop in the car? If so it will be easier to argue in court with, I had 2 cops, 1 being a senior sargent so even if he made up all lies (90% of what he said was in my case) the judge will believe them over u.