The Office of Personnel Management is a large federal bureacracy that runs the Civil Service of the federal government.
It never has outsourced the key functions of its office. The OPM website shows a partial list of the scope of the OPM.
http://www.opm.gov/One of its ancillary functions is to run background checks on federal employees who apply for government employment.
After a report is received then civil servants are scheduled for test by OPM employees. Once hired the OPM works as the Human Resource wing of the Government.
Conducting background checks (checking databases for criminial convictions, military service and credit background) is conducted by USIS which was part of OPM and then privatised as you noted by the Clinton administration. The USIS never had any involvement in anything besides background checks for OPM. Reportedly Carlyle has sold that interest.
http://en.wikipedia.org/wiki/Carlyle_GroupThe Carlyle Group was once a major investor in US Investigations Services, which is the privatized arm of the United States Office of Personnel Management's Office of Federal Investigations, but has since divested itself, selling its stake to Providence Equity Partners in 2007.
In any case USIS, the Carlyle Group never had any involvement in administering Federal Employee Benefit plans as OPM has done for all federal employees and will now be doing for the state exchanges.