Studies exonerate more than 99.9% of racing greyhounds,  but not necessarily their trainers             GAINESVILLE,  Florida––If dogs could do drugs unassisted,  the hard-working,  short,  highly stressed life of a racing greyhound might drive many times more to substance abuse than just the 1,150 greyhounds among more than 700,000 known to have flunked race day urine […]