In Bihar mastermind of Intermediate Examination merit scam Lalkeshwar Prasad Singh and his wife Usha Sinha have been sent to jail on Tuesday. They were produced before local court of Patna and the court sent them for 14 days judicial custody. They were arrested by special investigation team (SIT) of Bihar at Varanasi yesterday. Lalkeshwar Singh is former chairman of Bihar School Examination Board.<br/><br/>Senior Superintendent of Police Manu Maharaj told AIR the police will request the court for police remand to interrogate them.<br/><br/>Meanwhile raids are on to nab four toppers who are still absconding.