Ill let you know that i have gotten my fair share of tickets. I sadly have considerable knowledge in this field. You say you weren't going that fast, that is understandable. Don't try the whole gun or speedo not callibrated because i promise you the officer will say in his police report that both were properly callibrated before use. The only way you will get off is if you did the right thing when you got pulled over. Did he ask you if you knew how fast you were going? What did you say in reply? If you said XX speed that is the lowest you will ever get, if you said not sure, i don't know ect, then medigate the ticket and they will lower it considerably. Thats about it.