"The overwhelming morbidity and mortality of treatment-refractory psychiatric conditions, ranging from mood disorders to addiction, suggest an ethical and public health imperative to use every avenue possible to pursue novel therapeutic agents. The work presented in this issue by Griffiths et al. and Ross et al., beyond its obvious implications for patients with comorbid advanced cancer and depression and anxiety, serves as a model for revisiting criminalized compounds of interest in a safe, ethical way. Should more members of the biomedical community follow their lead, there is much potential for new scientific insights and clinical applications. – J.A. Lieberman, M.D. former President of the American Psychiatric Association, 2016