Queensland Racing Integrity Commission Stewards have received notification from the Queensland Government Racing Science Centre that Cobalt in excess of the permitted threshold has been detected in a urine sample taken from ZAC MAC NZ prior to it competing at Albion Park in Race 3 on 4 June 2016. Trainer Darren Hooper has been notified of the discrepancy and the reserve portion of the sample has been referred for confirmatory analysis.