I'd recommend talking to your son directly. This is a family issue is it not? A 17 year old runaway problem is a problem that should be solved by the family, not the district attorney. My appologies if that sounds like a value judgement. It's not.
To prosecute criminals.
The crown attorney
No, the U.S. Attorney will prosecute, at his or her complete discretion, after an investigation by the Postal Inspector.
The district attorney or other prosecuting attorney's office.
To handle police cases and to prosecute people.
Prosecute crimes within the county.
A special prosecutor would be appointed. It is normally a prosecutor from a neighboring area, or an experienced defense attorney.
You don't prosecute someone for this, the District Attorney does. You would need to speak with your local police department and tell them what happened and they can get the ball rolling for this.
In state courts it is the Office of the State's Attorney. In the Federal courts it is the Office of the United States Attorney. (the judge) for most
You should talk to either an attorney or the prosecuting attorney for your jurisdiction.
Something is not right with this question. Did the defense attorney suddenly go to work for the prosecutor's office?
It isn't your job to prosecute the rapist, it is the district attorney's. Take it to the police, and let them figure it out.