The spate of recent corporate scandals has produced a legislative and regulatory reaction aimed at restoring marketplace integrity. This response - consisting notably of the Sarbanes-Oxley Act of 2002, implementing regulations and stock market listing standards - has, in turn, affected...

Regulators must rely on science to understand problems and predict the consequences of regulatory actions, but science by itself cannot justify public policy decisions. We review the Environmental Protection Agency's efforts to justify recent changes to its National Ambient Air Quality Standards...