This new edition continues to anchor learning public health law in foundational themes while adding recent cases and materials that are rapidly changing the landscape of constitutional doctrine and legislation. The fourth edition includes new decisions on religion, speech, COVID-19, reproductive rights and health care, firearms, and administrative agency power. As in previous editions, the book offers diverse perspectives on the implications of shifting legal doctrines for defining public health issues, federal and state powers, privacy, surveillance, substance use, the food supply, health insurance, epidemics, disaster preparedness, and human rights. Students develop a durable framework to analyze competing interests among public and private entities, individuals, and human rights in multiple contexts as the law evolves.