A year and a half after being signed into law, the Horseracing Integrity and Safety Act (HISA) is expected to kick into action Friday, meaning a new uniform set of medication rules and safety standards that everyone can abide by--that, at least, was the plan. The execution has somewhat thrown those intentions to the wind in the near term, with a piecemeal approach to implementation that has seen the anti-doping and medication control arm of the program pushed back to early next year, and several other features of the law--such...