Singh, at present posted as Assistant Commandant of 75th Punjab Armed Police after being shunted out as Superintendent of Police (Headquarters) Gurdaspur, underwent the polygraph (lie detector) test for two consecutive days.
An official spokesman of the National Investigation Agency(NIA) while saying that the polygraph test was over refused to share any details as it could hamper the ongoing investigation into the terror attack.
Singh had agreed for a polygraph test after NIA informed a designated court about alleged "inconsistencies" in his statements before Punjab police and the NIA.
The NIA is questioning Singh to ascertain the sequence of events that took place after he was kidnapped on the intervening night of December 31 and January 1 by terrorists of Pakistan-based Jaish-e-Mohammed(JeM).
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Singh came under the spanner after he had said that he and the cook were released after their abduction whereas one of their friends, who was travelling with them -- Rajesh Verma -- had been left bleeding midway by the terrorists.
Terrorists had struck at the IAF base on the intervening night of January 1 and 2 in which seven security personnel were killed in the encounter that lasted for three days.
Four bodies of terrorists were recovered while two others are believed to have been burnt in the building where they were holding during the encounter which lasted for 80 hours.