The Florida Department of Law Enforcement on Wednesday defended its 2009 investigation of alleged abuse at a now-defunct Panhandle reform school in response to conflicting information in a recent academic study.

The University of South Florida’s interim study cited 13 more deaths and 19 more gravesites at the school than listed in the FDLE’s investigative report. FDLE officials attributed the variations in part to the differing natures of criminal investigations and anthropological research.