Why is govt not allowing AIIMS to do Mukhtar's postmortem: Afzal

After police said that no poison was found in viscera report of gangster-politician Mukhtar Ansari, his brother Afzal Ansari alleged that nails of Mukhtar were not examined which is important to detect if the person died due to poison. "I will be satisfied if the postmortem is done by AIIMS doctors but government is not accepting this demand," he added.