After winning the first two legs of the Triple Crown, California Chrome's bid to make history may be in doubt.

Several outlets are reporting that horse's nasal strips, which he's worn in each race during his current six race win streak, have been prohibited in the past in New York, according to USA Today.

Apparently these breathing strips are similar to ones used by people. They basically just open the nasal passages to allow for easier breathing.

USA Today reports this isn't the first time this issue has come up with a Triple Crown contender:

In 2012, I'll Have Another was the last horse to win the Derby and Preakness. He had worn nasal strips but his handlers were told he couldn't wear one in the Belmont. They were preparing to do so until I'll Have Another was scratched with a leg injury the day before the race.

The article says the 2012 ruling didn't come from the New York State Racing and Wagering Board, rather from the race stewards.

Trainer Art Sherman indicated to USA Today that California Chrome's co-owner Perry Martin, quote -'might not run if they say you can't run with a nasal strip.'

It's hard to believe on the brink history, an owner two-thirds of the way to the Crown wouldn't run his horse, but I guess we'll have to wait and see.

The site also quotes the state race officials as saying:

"If a request to use nasal strips is made, the decision on whether to permit them or not will be fully evaluated and determined by the Stewards."

But, it says, so far a request to allow the strips hasn't been made.

The feat hasn't been seen since 1978, when Affirmed won the all three legs of the Triple Crown - The Kentucky Derby, the Preakness and the Belmont Stakes.

Here is a look at other horses who've come come up just short of history.

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