Not sure about other tracks but the mutuel department at Keeneland can track the source of any wager that they handle, on track or otherwise.
imo, HANA, or a similar bettor integrity type organization, should have someone with the authority of being able to contact the mutuel manager of any N.A. race track and get the context of the wagers made on these races where significant fluctuations in the odds occur. Probably wouldn't take more than a few minutes if it was an on track wager, a bit longer for a wager from another track or OTB, and longest if it was through a ADW site. It can be done though, especially since the wagers causing the late odds changes should logically show at the top of the report.
It's one issue in this game where more transparency really shouldn't be that hard to provided.
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