The downside of this is that doctors may be afraid that opening peer review to supervisors could lead doctors to stop reporting any problems and issues.
This is almost unheard of and getting the records could ensure another potential legal battle. BD 
In a fight that could have wide-ranging implications, Los Angeles County supervisors are pushing to see confidential medical records used by county doctors to evaluate their peers to determine whether they have met accepted standards of care, saying they need the information to ensure patient safety and justify settling malpractice claims against the county.
Access to such information emerged as an issue earlier this year after concerns were raised about peer review at Olive View- UCLA Medical Center. An anonymous letter to state regulators alleged that among other problems at the county hospital's neonatal intensive care unit, doctors and staff were not meeting to discuss medical mistakes and that peer review was "missing."In May, Supervisors Michael D. Antonovich and Gloria Molina sent a letter to John Schunhoff, interim chief of the county's Department of Health Services, requesting access to relevant peer review records at Olive View. They cited county counsel's advice that they had authority to review the documents "for the purposes of monitoring and oversight."
L.A. County supervisors want to see doctors' peer review documents from hospitals - latimes.com