An investigation from WJHL in Johnson City, Tenn. revealed 251 cases of abuse, neglect and exploitation at a Greene County developmental center since 2002.

Internal investigations from the Department of Intellectual and Development Disabilities revealed that, despite hundreds of documented cases, only 20 employees at Greene Valley Developmental Center lost their jobs in the last six years. The news channel found that many cases of substantiated abuse and neglect were never reported to police.

A district attorney opened two criminal investigations after WJHL’s five-month investigation.