If you made a left turn from a lane that was not designated as a left turn lane, there is no defense as to that specific issue. It does not matter if you did not realize it was not a left turn lane. Maybe there is something with how the ticket was written, etc. Visit a traffic attorney and see what they have to say.
This answer posted on Avvo is for informational and educational purposes only. There is no attorney-client relationship created or formed and you should not rely on this as legal advice. You should consult with an attorney immediately.