a. Rules for active investigations.

Section 708(b)(16)(vi) exempts:

A record that, if disclosed, would do any of the following: (A) Reveal the institution, progress or result of a criminal investigation, except the filing of criminal charges. (B) Deprive a person of the right to a fair trial or an impartial adjudication. (C) Impair the ability to locate a defendant or codefendant. (D) Hinder an agency's ability to secure an arrest, prosecution or conviction. (E) Endanger the life or physical safety of an individual.