Superintendent of police with the CBI ACB Rajkumar Vhatkar confirmed the development, but refused to divulge any further details.
Jatinder Singh had been transferred out of the NDA by the Defence Ministry after the CBI booked its six employees including Col Kulbir Singh, the staff officer of the commandant, for allegedly taking bribes from candidates appearing for subordinate jobs including that of cooks, gardeners, lab attendants, library attendants and cadet orderlies.
The scam had come to light in June and Jatinder Singh had to step down from his post as the NDA commandant the next month.
The CBI had earlier questioned Col Kulbir Singh, physical training officer, Col A K Singh, a civilian staffer and five others in this connection.
The agency had arrested Kulbir Singh along with five others for allegedly receiving bribe from candidates during a recruitment drive at the NDA. All of them were released on bail.
The CBI had earlier alleged that the accused had obtained illegal gratification of Rs 3 lakh to Rs 4 lakh from each candidate.
The investigative agency further said that the accused had allegedly taken signatures of those candidates, who had agreed to pay bribe, on blank sheets and later filled them with correct answers.