Indian authorities have arrested Ranganathan Govindan, owner of Sresan Pharmaceuticals, after his Coldrif cough syrup was linked to the deaths of at least 17 children in Madhya Pradesh. The syrup, consumed by children under five, contained diethylene glycol (DEG) at levels nearly 500 times above the permissible limit. The product has been banned in several states, and the WHO has raised concerns about regulatory gaps in India's drug screening system. What measures should be taken to prevent the circulation of contaminated medicines in India?