More than half of the District employees who award city contracts worth millions of dollars are not properly certified and none have been subject to a criminal background check, an audit has found.

The city’s Office of Contracts and Procurement has habitually neglected training and requiring professional certification of the 23 full-time employees who dole out millions of dollars in contracts annually, according to the audit by the Office of the Inspector General. Just 10 of the 23 contracting officers have professional certifications.