The state auditor general says the Department of Children and Family Services did not have current photos of some children in its care.
The audit also shows a growing number of abuse reports are not resolved within the required 60 days. The agency missed the deadline in more than two percent of cases last year, up from less than half a percent in 2001.
The report calls for more staff to make sure contractors hired by DCFS are not cheating the state or providing shoddy care to children.
Agency officials say they are taking steps to improve record-keeping and oversight.