Undertaking / filtering on left?

quick question...
if you're stopped by a rosser and they say, "yu just jumped a red light heres a fine" what happens if say, "No i didn't, prove it! I'm innocent until proven guilty"

If you did jump the red light and they saw you, they would think that you were a right tit and probably take it further. If you didn't, just calmly point it out to them. NEVER use the last sentence. They know that; you know that.