The global opioid epidemic has been called the worst drugs crisis in history. CGTN Europe's The Agenda program spoke to Ruth Dreifuss, a former president of Switzerland, and now chair of the Global Commission on Drugs Policy, who says the "overprescription of opioids was the driver of this crisis." Here she explains what blame the big pharmaceutical companies should shoulder for the current opioid crisis and what should the world be doing to prevent the spread of opioid addiction.