Four months after the state attorney general launched a criminal investigation into the misuse of jailhouse informants in Orange County, Sheriff Sandra Hutchens is raising concerns that her deputies have not yet been questioned.

Her remarks are in addition to her assertion Friday that she's "not confident" in the inquiry, which is probing allegations that evidence was intentionally withheld in the case of Seal Beach mass murderer Scott Dekraai. Hutchens made that comment during a meeting about oversight of the Orange County sheriff’s department.

Attorney General Kamala Harris announced in March that her office would investigate allegations of "discovery misconduct" that surfaced during the Dekraai case.

Hutchens said all law enforcement agencies involved, including the Orange County District Attorney’s office and other police departments, should be reviewed.

"I am perfectly willing to have our department looked at and our role in this looked at," Hutchens told KPCC. "But again, I think that it’s connected. They’re all connected and we have to look at it as a whole."

Hutchens said that she began to have questions about the investigation after Harris' office accused her deputies in a court brief of withholding jail records about informants from the defense in the Dekraai case.

The "misconduct" was "solely attributable" to the sheriff's office, the attorney general's office asserted in the brief, which was appealing an Orange County Superior Court judge’s decision to remove the district attorney’s office from Dekraai’s case.

A spokeswoman for the attorney general said the criminal investigation into misconduct during the discovery phase of the Dekraai trial is indeed underway, but she could not comment on who has been or will be questioned.

For his part, District Attorney Tony Rackauckas announced this month a panel that is reviewing the office’s polices and practices on informants and is expected to file a report at the end of the year.

"They are really independent," said D.A. Chief of Staff Susan Kang Schroeder. "They don’t take direction from us."

Meanwhile, the calls for an even deeper investigation into the misuse of jailhouse informants have grown.

Dean Erwin Chemerinksy of the University of California, Irvine School of Law told Orange County supervisors on Friday that an independent investigation is needed.

"We do not know how pervasive the problem is," he said. "We do not know how many criminal convictions may be tainted because of it."

In a July 24 op-ed in the Orange County Register, Chemerinsky called for the U.S. Department of Justice to launch an investigation.