Islander Marc Campbell, the winning driver at this year's Gold Cup and Saucer Race, says he will appeal a 31-day suspension handed to him last week after his horse tested positive for drugs.

Campbell of Winsloe, P.E.I., said the violation is connected to a race in mid-August, held before the Gold Cup and Saucer, with Kellys Cross, a horse he trains and drives.

The horse tested positive for drugs.

Campbell said he was floored when he found out.

"There's two possible solutions, you know, the lab made a mistake, which I'm hoping I think, or someone tampered with my horse. That's the way I feel. It's a non-performance enhancing drug, it’s like an anti-inflammatory. It’s almost like you're taking Tylenol type of thing," he said.

The director of racing at the Maritime Provinces Harness Racing Commission said he can't comment on Campbell's case because it's under appeal.

Paul Hogan said all post-race testing done on Prince Edward Island is the responsibility of the Canadian Pari-Mutuel Agency, a regulatory body based in Ottawa.

The Gold Cup and Saucer is a prestigious harness race in the Maritimes,  capping off Old Home Week.

In January, Campbell won the O'Brien Award of Horsemanship, Canada's most prestigious awards in harness racing.

He has earned more than $500,000 over his years driving and training.