Prison Media Spokesman T.N. Upuldeniya said that a detainee was seized after authorities found 100 packets of heroin stashed in his anal cavity.
He said 20 grams of Kerala grass were also amongst the recovered drugs.
The Maligakanda Magistrate ordered to remand the 24-year old suspect when he was produced before Court on July 17th.
Later, on receiving a tip-off, the prison intelligence officials referred the suspect for a medical test and found the narcotics inside his body.