Eliot Spitzer was not charged with violating state law because, unlike four of his top subordinates, he was not involved in the misuse of State Police to discredit the ex-New York governor’s keenest political enemy, said the executive director of the Commission on Public Integrity.

Speaking Friday for the first time about the investigation that took more than 10 months to complete, Herbert Teitelbaum also defended commissioners against the “distressing” charge of being biased because of who appointed them and said investigators came to depend on advice from a “working group” of five commission members as their inquiry played out.