Because Obama will be present, other leaders may seize the opportunity to share with him their views on what is increasingly called the “failed war on drugs,” the anti-drug program originally launched by US President Richard Nixon in 1971. Recently inaugurated Guatemalan President Otto Pérez Molina, together with Santos and other heads of state, question today’s punitive, prohibitionist approach, owing to its enormous costs and meager results, and propose a different strategy: legalization.