Despite an advisory designed to eliminate stable-wide usage of thyroxine that has been in effect since the California Horse Racing Board (CHRB) investigated seven sudden deaths of horses trained by Bob Baffert in 2013 and found that all of them had been administered that drug "more as a supplement than a medication," the use of thyroxine in Southern California remains astoundingly high. In introducing a new rule proposal on Thursday to curb thyroxine use "to the point that it really will not be used any longer within CHRB facilities," CHRB...