Truth.

Reason Magazine - Hit & Run > Dodging Baseball's Speed Limits:

"Intriguingly coincidental as the spike in ADD diagnoses looks, a more important question is why this is any of Tierney's business. 'We shouldn't have to have hearings like this all the time to stay on top of these problems with baseball,' he said. They don't have to, of course; they choose to. They can stop anytime they want. And given that the Constitution does not grant Congress any authority to dictate the rules by which baseball is played, that would be a good idea.

Nor is it clear what 'problems with baseball' Tierney has in mind. Amphetamines were first marketed in the United States in 1932. Seventy-four years later, Major League Baseball, under government pressure, told players to stop using them. This does not seem like an emergency of any kind, let alone one that should occupy the federal government."