Horse racing is a sport genetically programmed in high emotion. It's hardly surprising then that the vet scratch-the ultimate sucker-punch after weeks and months of best laid plans-should prove such a test of nerves. The problem is, diagnosing subtle lameness can be such a subjective venture. And where there's uncertainty, doubt can quickly escalate to condemnation. A recent TDN compendium of data collected from around the country, however, shows that scratched horses run a much higher than average risk of harboring an injury. Numbers from California, Florida, New York, Kentucky...