Perhaps we could somehow design a system that makes repeat scrambles basically impossible. The trick would be to (a) isolate the scrambles so a scrambler can't do the wrong one, and (b) make sure the judges don't forget to write down a result. Here are a few ideas.
1) Have the judge do the scrambling right there, perhaps with some kind of opaque thing they can slide over the scramble sheet to make sure they never accidentally use the wrong move sequence. Of course this only works with short puzzles (where the scramble only takes a little time), and requires the judge to be a cuber.
2) A bit more involved: have a separate scrambling area for each solve - maybe a table, maybe just a makeshift cubby or booth - and a separate scrambler for each one, who only has the one scramble. The judge would have to keep track of which scramble number they are on, and either return it to the next booth or tell the runner what number that solve was, but assuming they did that it would be foolproof.
3) Set up a computer system where you select the competitor's name from a dropdown box or something, and select the event, and it pops up their next scramble. The computer would keep track of which one has been done so nobody else has to. We'd have to have a good user interface that makes it easy to get 2+ scrambles for the same person in a row, and also makes it hard to accidentally skip someone's scramble. The problem here is making it work with multiple human scramblers at once without messing up.
