for those who get railroaded into traffic court anway, this is from georgia. this is where u can bring the constitution in as a defense:
16-1-3.
As used in this title, the term:
(1) 'Affirmative defense' means, with respect to any affirmative defense authorized in this title, unless the state´s evidence raises the issue invoking the alleged defense, the defendant must present evidence thereon to raise the issue. The enumeration in this title of some affirmative defenses shall not be construed as excluding the existence of others.