Supervisors at the U.S. Geological Survey conduct such lax reviews of the agency’s travel cards program that employees and even volunteers are overpaid by thousands of dollars, according to a report by the Interior Department’s internal watchdog.

USGS limited the DOI inspector general’s review of travel documents, blocking the watchdog’s access to 50 of the files in GovTrip, DOI’s expense-tracking system. The agency also locked one traveler’s account so that the IG couldn’t review it. As a result, the IG was only able to look at half the documents it sought to review.

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