Allegations of widespread doping, animal cruelty and collusion in Australia's multi-billion-dollar greyhound racing industry have been uncovered by a 7.30 investigation.
Australia's greyhound industry is the third biggest in the world, and each year Australians wager about $3 billion on the sport.
In the past year more than 70 dogs have tested positive to banned substances, but insiders say many more cheats go undetected and use popular drugs including cocaine, amphetamines, caffeine and EPO, the performance-enhancing hormone favoured by disgraced cyclist Lance Armstrong.
The relentless quest to produce a winner has also led to massive over-breeding, which results in up to 17,000 dogs being killed each year, some by inhumane means.
Many trainers are also in open revolt at greyhound racing authorities, who they say favour the richest players and hand down inconsistent punishments.
Sydney trainer Christos Arletos has been racing greyhounds for 25 years and says there "never was, and never will be" a level playing field.
"Eighty per cent of greyhound trainers are looking for something to dope their dogs," he said.
"I can't compete with the high quality of drugs when they use them."
Whistleblower and vet Ted Humphries, who sparked an inquiry into the industry, says cocaine is a popular choice among cheats.