The outsourcing of clinical trials to Latin America by the transnational innovative pharmaceutical industry began about twenty years ago. Using archival information and field work in Argentina, Brazil, Costa Rica, Mexico and Peru, the authors discuss the regulatory contexts and the ethical dimensions of human experimentation in the region. More than 80% of all clinical trials in the region take place in these countries, and the European Medicines Agency has defined them as priority countries in Latin America. The authors raise questions about the quality of data obtained from the trials and the violation of human rights during their implementation. Their findings are presented in this volume, the first in-depth analysis of clinical trials in the region.