Arun, who was under suspension following his arrest in connection with this case, was earlier involved in several criminal cases, involving supply of fake currency notes, robbery and criminal intimidation and procurement of passport on the basis of a false declaration.
He was earlier dismissed in 2007 but was later re-instated on the directives of a judicial verdict, a release from SP (District) said here today.
The release said holding department enquiry against him was practically not possible on account of his earlier cases, one of which involves threat and criminal intimidation.
His dismissal was ordered under Article 311(2) (b) of the Constitution read with Rule 9.12 (ii) of A&N Police Manual 1963.
Dismissal under these provisions is provided for when there are serious grounds to establish that the delinquent government employee is such that no one is willing to testify against him/her in a Department Enquiry due to fear of consequences, S B Deol, DGP, A&N Islands told PTI.
Last week the police department had dismissed police inspector Abdul Salam on the same ground.
Three persons, including a school principal, were arrested on Mar 4 from Car Nicobar island on the charge of leaking question papers of the ongoing CBSE examinations.
Krishnan Raju, principal of Government Senior Secondary School at Lapati; Rashid, an executive engineer of the Andamans PWD; and Vijayan, a forest ranger, were arrested for leaking the question papers, officials in the Directorate of Education department had said.
The question papers involve science subjects of class X and XII, regional director of CBSE Nagarajan said.