Maloney covered this in his book, and actually did find instances of past posting, but most of the time it's just late money that comes in and doesn't get counted until after the race starts. All this really proves is that there are some good players out there who are looking for overlays and a lot of money comes in late. The only way to stop this type of odds change after the start of the race would be to stop taking bets a couple of minutes before the race starts, but I don't see that happening.
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