Matthew Leek is the latest Victorian trainer to have a horse return a cobalt positive.

Racing Victoria stewards told Leek of the confirmatory findings on Tuesday.

The Leek-trained Champagne Kisses returned a reading of 531 micrograms per litre in urine in a sample taken before she was unplaced in a maiden at Pakenham on March 3.

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The reserve portion of the sample detected cobalt at a concentration of 600 micrograms per litre in urine and the threshold is 200 micrograms per litre in urine.