Greg Kelly is the son of NYC Police Commissioner Ray Kelly. A woman has accused him of rape. The Police Department has referred the investigation to the office of Manhattan District Attorney Cy Vance. Vance's office does have investigators and would ordinarily prosecute any such charge if warranted.
Yet the D.A.'s office works closely with the Police Department and Ray Kelly and Vance must have a good working relationship to do their jobs well.
Should Vance's office investigate Ray Kelly's son and decide whether to prosecute?
I don't think so. I think the matter should be referred to the State Attorney General (which can be done) or, second best, a prosecutor outside the city.
That does not mean that the D.A.'s office won't try to do a good job and may well do a good job. But I don't think, given the seriousness of the charge, that the office should investigate or prosecute the son of the Commissioner. The critical concern here is public confidence that the work is done with independence and objectivity.