Trainer Sam Kavanagh will front an inquiry later this month after Midsummer Sun returned illegal levels of cobalt and caffeine after winning the Gosford Cup in January.Trainer Sam Kavanagh will front an inquiry later this month after Midsummer Sun returned illegal levels of cobalt and caffeine after winning the Gosford Cup in January. Photo: Paul Harris

Besieged veterinarian Tom Brennan has voluntarily stood down from a special focus group designed to represent thoroughbred racing practitioners as Racing NSW stewards joined their Victorian counterparts in issuing charges against the Flemington Equine Clinic partner.

Brennan was stung with 11 charges on Thursday stemming from the ongoing Sam Kavanagh cobalt inquiry for allegedly helping the embattled trainer administer or cause to administer cobalt to Midsummer Sun before his Gosford Gold Cup win in January.