Oh, and to Compass' original question, I've wondered the same thing.
I am going to guess that they do use voided data, because it is just as relevant to them as unvoided data. I am not sure though. It's not the voided data for that administration, but rather the voided data for the questions that appeared on your exam from previous administrations.
I still wonder why it takes so long to score the exams though if it truly is a predetermined scale as AAMC states. I also wonder why when some people get scores it shows 13-14 on a section until it is resolved to one of the two (This happened for the 3/28 exam I believe).
The whole system blows me away. I feel like they think they're being straightforward, but then I'm not sure why that can't state why it takes so long to grade them and a score doesn't pop up as soon as you submit for the 3 numerical sections... Some written exams like the LSAT that aren't on the computer are back in less time than it takes for the MCAT to get scored.
Oh, and people can say it's because they check for cheating, but I'm sure they could come up with a simple algorithm that analyzes similarities in answers at given testing centers, then if they find something, they can reference the centers tapes. It shouldn't take 30 days though.