Trainers Lance O'Sullivan and Andrew Scott have been charged over doping three of their horses, including a placegetter at last year's New Zealand Derby.
The Racing Integrity Unit's (RIU) acted following an investigation over Cobalt irregularities, but O'Sullivan and Scott claim their horses were exposed to heavily Cobalt-dosed water troughs the horses shared with dairy cattle.
The RIU maintains the readings came about by the oral feeding of Cobalt in high concentrations.
The three horses under investigation are Sound Proposition, Quintastics and Suffire.
The cobalt threshold in race horses is 200 micrograms per a litre of urine.
Sound Proposition was swabbed and returned a 541 after finishing third in the New Zealand Derby in February last year.
Newshub.
