The time to challenge the officer's testimony was during your trial and not after. You do not get a second bite of the apple. Just because your recollection of what transpired differs from that of the officer does not mean his testimony was false. If we follow that logic, he could allege your testimony was false because it differed from his recollection of events. Have you considered the possibility the officer made a hand gesture for you to pull overt but you failed to see it?
The fact that the officer failed to appear for your friend's trial resulting in a dismissal has no bearing on your matter. Just because your friend benefitted from a procedural error doesn't mean King's X for you.

