In Defining Drugs, Richard Henry Parrish II argues that the federal government became arbiter of pharmaceutical fact because the professions of pharmacy and medicine, as well as the pharmaceutical industry, enforces these definitions and standards through police powers reserved to government. In a new introduction to this edition, Parrish argues that an amendment to the United States Constitution is needed to protect health freedom from government and industry intrusion.

Parrish begins his provocative study by examining the development of the social system for regulating...