Chennai, Oct. 10 -- Tamil Nadu on Thursday said that the Union government and Madhya Pradesh didn't act after the state had informed them that they had found contamination with toxic substances in the Coldrif cough syrup from samples that were tested. "After Madhya Pradesh wrote to us on October 1, Tamil Nadu immediately investigated, found contamination and informed Madhya Pradesh, Union ministry of health and family welfare, and states of Odisha and Puducherry," Tamil Nadu's health minister M Subramanian said. "But, Madhya Pradesh and the Union government left it saying that there was nothing wrong with this medicine (Coldrif). But, we confirmed how much contamination is present in the medicine and we issued a "stop production" order on...