Section 225(1) in The Indian Post Office Rules, 1933
(1)The following articles shall in no circumstances, be forwarded to their destination, delivered to the addresses or returned to the country of origin but shall be disposed of in accordance with the provisions of the Act and the rules made there under:-(i)Opium, morohine, cocaine and other narcotics, provided that this prohibition shall not apply to consignments sent in insured boxes or in parcels for a medical or scientific purpose to countries which admit them on this condition:(ii)Explosives or inflammable substances;(iii)Dangerous substances; and(iv)Obscene or immoral articles.
