There was evidence against Nupur Talwar in Aarushi-Hemraj murder case but senior CBI officers prevented her arrest, agency investigator told special court here during cross examination. CBI Additional SP AGL Kaul, who led the second probe team in the sensational double murder, was asked by the defense counsel to explain why Aarushi's mother Nupur was not arrested if there was enough evidence against her. Kaul said his senior, DIG Neelabh Kishore, did not support the view and stopped him from arresting her.