"We have applied section 3 of the CCA against Pappu Yadav in view of elections in the constituency tomorrow," Superintendent of Police Nyer Hasnain Khan told PTI.
Khan said under section 3 of the CCA, Yadav would have to report to the satisfaction of station house officer of Purnia police station twice a day, failing which, he would be externed from Purnia district limits.
"The SHO is required to report to superiors about Yadav's behaviour on a daily basis," he said.
Yadav, who is facing life-term in the Communist Party of India-Marxist Member of Legislative Assembly Ajit Sarkar murder case and is now on bail, is in his home town Purnia canvassing support for his mother who is locked in a virtual triangular fight with Bharatiya Janata Party's Udai Singh and Lok Janshakti Party's Shankar Jha. His wife Ranjit Ranjan is seeking a second term from adjoining Supaul Lok Sabha seat on a Congress ticket.