Delving into the intricate web of clinical research and psychotropic drugs, On trial illuminates the captivating story of psychiatrist Roland Kuhn. Long celebrated as the discoverer of the first antidepressant Tofranil, Kuhn has more recently become the subject of controversy after patients exposed his extensive drug testing on unwitting subjects at the Münsterlingen Psychiatric Clinic in Switzerland. But is it fair to condemn him according to today's ethical standards, which themselves emerged from the research practices of his time? Drawing on Kuhn's extensive, newly accessible private archive, this book explores the early era of industry-sponsored clinical research in psychiatry. It unravels the interplay between the clinic, patients, physicians, nurses, corporations, and authorities, examining the forces that converged during the experiments. Spanning the decades from the 1940s to the 1980s, the Münsterlingen drug trials are meticulously situated within the evolving landscape of medical experimentation. Which people and institutions were involved, and who knew what? How were substances tested, which patients were affected? According to which patterns were the drugs administered? When did which values, guidelines, and standards apply, and what role did they play in practice? On trial not only reconstructs the Münsterlingen drug tests but also weaves them into a broader tapestry about the historical development of clinical trials. This thought-provoking exploration enriches our understanding of the psychopharmaceutical journey while challenging us to consider the enduring ethical dilemmas that underpin medical research.