In an effort to support countries to move forward with the implementation of the UNGASS 2016 follow-up process, Mexico together with the Pompidou Group, organised a joint executive training seminar on ‘Evaluation of drug policies and development of new indicators to measure the effectiveness of drug policy’. The activity took place on 5-7 November 2018 at the Training Centre of the Prosecutor General in La Muralla, Mexico with 60 participants and speakers from UNODC, OAS/CICAD, and the COPOLAD programme of the EU. The training focused on new trends and challenges and gave participants insights how to practically evaluate drug policies.