PATNA, Aug. 6 -- Patna police on Wednesday arrested a man for allegedly impersonating PA of union minister Rajiv Ranjan Singh alias Lallan Singh and called Inspector General (IG) Jail asking him to shift an under trial prisoner to Beur jail from Bhagalpur jail, police said. City SP (central) Mamta Kalyani said that during interrogation Dheeraj Kumar revealed that he had been posing as PAs, senior officials and judges to obtain work, she added....