Victorian horse trainer Mark Riley has been cleared of a doping charge and had his three year ban overturned by the Supreme Court.

The Racing Appeals and Disciplinary Board found Riley guilty of administering a prohibited substance after one lab found his horse Gold For Kev was above the TC02 limit permitted by the rules of racing.

On Thursday, Justice Kevin Bell upheld an appeal by Riley saying the rules did not permit a disqualification to be imposed upon the basis of rounded-up test results and the scientific evidence was incapable of supporting a finding of guilt.