bad assumption, he can win. The cop has to show evidence supporting that he was going the said speed. If he cant show evidence then the case is thrown out. Thats how it works, and when thats the case the cop usually wont show up.
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"so persuasively did they talk; and yet there is hardly a word of truth in what they have said."
Plato, Apology
"On life's journey faith is nourishment, virtuous deeds are a shelter, wisdom is the light by day and right mindfulness is the protection by night. If a man lives a pure life, nothing can destroy him."
Buddha