@JalapenoGreens (re post #19):
I believe you are correct.
Duke considers every candidate’s best CR, Math, and Writing SAT I scores plus his two best SAT II results (http://admissions.duke.edu/application/instructions#testing). However, Duke REQUIRES applicants to submit their COMPLETE SAT (and/or ACT plus Writing) testing records, for ALL examinations taken during high school (box on upper right of the same webpage, and elsewhere on Admissions’ website).
To summarize, every applicant MUST provide the results of EVERY SAT (I and II) or ACT (with writing) examination, however, Duke will assess the best scores.
The foregoing policy was slightly altered for this year’s undergraduate applications; who knows, next year’s might again be modified?