This contamination problem is well known in the pharmaceutical trade and is due to substandard glycerin, a commonly used sweetener. DEG is the main component in antifreeze used to protect car engines and is highly toxic to humans. We owe our safe drug system to the practices applied by FDA and the standard established independently by the United States Pharmacopoeia. It's an international scandal that, over fifty years later, dealers in these poisonous pharmaceuticals elude justice. These dealers can expect a reserved seat in hell, but we need a secular way to deter others from such conduct in the future.
Safe drugs are, or ought to be, a basic human right.
This is not a new concept when a Roman court during the reign of Caesar declared that the safety of the people shall be the highest law. One way to address this problem is a United Nations convention to reach across national borders. It should provide a system of practices and standards for pharmaceutical manufacturers and ingredient suppliers in international commerce. Events producing death or serious permanent injury could be investigated by World Health Organization staff for potential criminal prosecution in the International Court of Justice in The Hague. This would put those in this business on notice that future malfeasance could cost them dearly.