This is 100% correct.
I got caught talking on my mobile phone by one of those overzealous, lycra-wearing female cops on a pushbike. Thing is, I was stationary, at a red light, in heavy traffic. That's right, the car wasn't moving at all, and it was a 15 second phone call to tell someone I was going to be late (and I had the phone bill to prove it).
I felt I was hard done by, so I rang up the court magistrate and told him what happened. His advice was:
"Yes, you can take that to court. You'll have to plead guilty, as you *WERE* talking on your mobile phone. Then plead extenuating circumstances and tell them the scenario. The judge will more than likely thank you for being honest and not wasting the court's time by pleading not guilty. He'll waive or reduce your fine, but unfortunately the court's decision and the RTA are two completely independant governing bodies. You can get off your fine, but since you were guilty of talking on your mobile phone, you'll lose the 3 points no matter what you do."
So instead of taking a day off work, losing income, and wasting the court's time, I paid the fine and went on with my life. Sh1t happens