Star Victorian greyhound Sweet It Is has returned a positive swab from both her Plaster Board Duke Of Edinburgh Silver Collar heat and final victories at Manukau Park.
Australia's highest-earning stake earner has tested positive to caffeine.
Her heat sample (May 31) was taken pre-race, while her sample from the $80,000 final (June 7) was post-race. Sweet It Is lowered the Manukau 779m track record in both of her races and the win in New Zealand's most prestigious race took her career earnings to $819,420.
The Arch Lawrence, Cambridge trained Shandell was the Silver Collar runnerup, while her kennel mate and litter sister Teemaria finished fourth. Splitting the pair was the Angela Turnwald-prepared Extreme Twist.
Greyhound administrators are stunned by the positives but say they are not in a position to comment owing to the New Zealand Racing Integrity Unit's on-going investigations, which includes the opportunity of owner-trainer Braden Finn having the B sample tested.