Jockey Zac Spain was stood down from Wednesday's riding engagements by stewards at Warrnambool.
Spain tested above the jockey blood alcohol limit of 0.02.
The Racing Victoria compliance team tested numerous jockeys for alcohol and drugs as part of their crackdown on racing guidelines.
The Melbourne-based jockey was booked to ride Polanco in the Wangoom Handicap and Exalted Crown in a restricted race on day two of the TAB May Racing Carnival.
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