Chapter 2 - Legislative history of animal-based research and implications for the shift to nonanimal methods

Animal research in the United States has witnessed an increasing emphasis on nonanimal models. The existing legislations have been critiqued for insufficient species coverage, lack of rigorous enforcement, and inadequate transparency. Ethical concerns, coupled with scientific progress, have accelerated the development of alternative research methods. Internationally, legislative frameworks are evolving to support nonanimal testing, with milestones such as the European Union’s Directive 2010/63/EU, which prioritizes alternative methods. Countries like Japan and India have also enacted guidelines and bans to limit animal testing. These initiatives reflect the principles of the 3Rs—replacement, reduction, and refinement—and promote innovative technologies like in vitro testing and organ-on-chip systems. Despite advancements, significant challenges remain in achieving widespread adoption of nonanimal research methodologies.