<prompt> Translate the following text to EnglishMwanahabari mmoja wa habari za maisha ya Reagan, Arthur Schlesinger, alisema: Nilikuwa na uchafu juu ya Reagan uliozikwa katika mfumo wake wa faili.  <response>: And in an interview, the authorized biographer concedes that he didnt investigate Arthur Schlesinger once told me that he had dirt on Reagan buried in his filing system. 