As it happened: A timeline of events in the cobalt crisis.As it happened: A timeline of events in the cobalt crisis. Photo: Jenny Evans

February 2014 
Fairfax Media exposes cobalt as a doping threat to racing worldwide. Cobalt abuse is suspected to be widespread in Australia yet Harness Racing NSW is the only jurisdiction with a threshold.

April 2014 
Racing Victoria establishes a threshold of 200 micrograms of cobalt per litre of urine and notifies trainers.

June-December 2014 
After a number of Harness Racing NSW inquiries, 10 trainers are disqualified for periods ranging from 30 months to 10 years for elevated cobalt levels.

September 2014 
An international racing conference in Mauritius discusses the cobalt threat and proposes a threshold of 100mcg/L, a level already in place in Hong Kong. Victoria’s 200mcg/L is described as generous.

October 2014 
Lidari, trained by Peter Moody, is second in the Turnbull Stakes.

November 2014 
The Danny O’Brien-trained Bondeigar is second in the Victorian Derby.

December 2014 
* Racing Victoria announces Lee and Shannon Hope as the first Victorian trainers to have horses (three) return cobalt positives.
* Racing NSW stewards charge trainer Darren Smith with more than 40 charges relating to 18 horses with elevated cobalt levels.

January 2015 
The Australian Racing Board introduces a nationwide cobalt threshold of 200mcg/L.

February 2015 
Racing Victoria stewards raid the stables of Peter Moody, Mark Kavanagh and Danny O’Brien. All three are alleged to have horses with cobalt positives.

March 2015 
* Racing NSW says trainer Sam Kavanagh has a cobalt positive.
* Racing NSW disqualifies Newcastle trainer Darren Smith for 15 years on 42 cobalt charges. His appeal fails.
* Cobalt positives identified in Western Australia and Queensland.

April 2015 
US racing jurisdictions considering plasma threshold of 25 and 50ppb across all states (equivalent to 100mcg/L and 200mcg/L respectively).

May 2015 
* West Australian trainer Sharon Taylor is disqualified for 18 months after pleading guilty to two cobalt charges.
* NSW stewards suspend Sam Kavanagh pending an inquiry into his cobalt positive.

June 2, 2015 
Queensland stewards disqualify trainer Glen Baker for two years after French Lesson returns a cobalt positive.

June 11, 2015 
Racing Victoria’s investigation culminates in trainers Lee and Shannon Hope, Kavanagh and O’Brien facing multiple charges. Vet Tom Brennan becomes the first veterinarian to be charged by Racing Victoria with cobalt offences.The investigation relating to Peter Moody is ongoing.