A man convicted in a narcotics case was arrested from Daulatdia red-light district early Friday.   Goalandaghat police arrested Masud Rana Mondol, 30, who has been absconding since he was jailed for six years in a narcotics case filed in September 2016.   Rana, a resident of Goalanda municipality’s Ghunapara area, is the son of Kashem Mondol.   Goalandaghat Police Station’s Assistant Sub-Inspector Motaleb Munshi said Rana was sent to jail through the court on Friday.