In civilian clothes, he looks as skinny as a middle-distance runner.

FORBES: Super Week--Then The Worst

He himself had begun his career as a college-champion long-distance runner, had then risen to a senior position with the railway company, and for years had travelled the railroads, covering tens of thousands of miles to assure himself and the authorities that the proper safety levels were being maintained.

NEWYORKER: In the South

And - as in the case of middle distance runner Diane Modahl - incorrect storing of a urine sample may alter its chemical components.

BBC: Doping: Banned substances