News out of Churchill Downs last week that two of trainer Saffie Joseph Jr's horses had collapsed and died within days of each other has reignited talk around one of the most confounding--and by extension, frustrating--issues in racing: sudden equine death. More than four years ago in response to the death of GI-placed Bobby Abu Dhabi (Macho Uno)--what was initially suspected a sudden cardiac-related event--the TDN took a lengthy dive into the issue. In a nutshell, sudden cardiac deaths oftentimes leave no discernable physical sign for pathologists to piece together...