More than 50 greyhound trainers have been caught drugging their dogs since an inquiry into the industry was appointed in May 2015, including a woman who posed with the opposition leader Luke Foley at a rally against the ban on the sport.

Goulburn trainer Kim Mulrine stood beside Mr Foley to protest the ban on greyhound racing in August, a month after she was suspended from racing greyhounds because one of her dogs tested positive to cobalt.

Opposition leader Luke Foley posed with suspended trainer Kim Mulrine at a protest against the ban on greyhound racing. Credit:Harriet Alexander

Then premier Mike Baird imposed the ban on greyhound racing in response to the Special Inquiry into Greyhound Racing in NSW, which uncovered evidence of widespread live baiting and other illegal activities including the administration of prohibited substances. He overturned it in October following protests.

Mr Foley, who campaigned against the ban, argued that it demonised the entire industry based on the misdeeds of a few.