The report issued by the Office of the State Auditor Tuesday claims North Carolina Alcohol Law Enforcement director John Ledford repeatedly tried to block the investigation into the alleged trips and ordered his subordinates not to talk.
"Crime Control management repeatedly tried to prevent, deter, delay, and control access," reads the audit.
The report says Ledford claimed he had an official business reason for his Friday trips across the state, but he provided insufficient documentation to support that claim.
In his response to the audit, North Carolina Department of Public Safety Secretary Reuben Young says his officials were correct in acting judiciously to screen information before releasing it to auditors because they have a constitutional responsibility to protect the rights of employees.
He also said auditors did not prove government vehicles were used improperly and called a recommendation for disciplinary action "inappropriate."
Ledford is a former sheriff of Madison County, he was appointed by Gov. Beverly Perdue in 2009 to lead agency after his predecessor resigned in the wake of a scandal involving missing guns and questionable spending.