All lawyers must comply with ethical rules. If they fail to do so they may be disciplined by their state's Bar Association.
Each state has their own ethical rules and they are called the Rules of Professional Conduct. They are based on the American Bar Association Model Rules of Professional Conduct.
The ABA Model Rules and most states require prosecutors to take investigative and remedial action when they are presented with a case of an innocent person in prison.
Prosecutors have a duty to be a "Minister of Justice". Prosecutors have a higher duty than other lawyers; they must seek justice, not a conviction.
Codes of professional conduct for specific states.