A judge is giving the state’s Division of Criminal Justice one final chance to argue why an index of records from a hush-hush criminal investigation involving Lt. Gov. Kim Guadagno should not be released to a New Jersey Watchdog reporter.

“I frankly don’t see why it should be kept confidential,” said Judge Mary C. Jacobson during a hearing in Mercer County Superior Court. “It’s highly unusual to keep a Vaughn index confidential.”

The 96-page Vaughn index lists 779 pages of documents gathered by DCJ during a probe requested in May 2011 by the Police and Firemen’s Retirement System board of trustees.