In 2012, some on the board said suspicious betting at this same track was a robotic betting error.
If you want to review the string, it was titled 10x worse than the Lasix Issue! dated 5/22/2012. Another error?? Doubtful.
http://www.paulickreport.com/news/ray-s-paddock/pool-manipulation-suspicious-betting-spotted-in-thistledown-race/
My understanding is, that books retain the right to refuse payout on a pool that has been deemed manipulated in that manner.
Something this blatant, even the dumbest of them would have figured it out.
None of the replies at Paulick mention this. Padding the pool is as old as parimutuel , so I think these folks will have trouble getting paid.