In March 2006, the Office of Inspector General (OIG) opened a preliminary investigation of U.S. Environmental Protection Agency (EPA) asbestos cleanup efforts in Libby, Montana, based on allegations that EPA failed to fully address scientific standards for cleanup and of possible contractor misconduct. The Special Agent conducting the investigation determined that, in his judgment, no criminal activity occurred. The Special Agent submitted an investigation summary to his superior on April 27, 2006, detailing the findings of his investigation and recommended that another component of the OIG evaluate EPA cleanup actions in Libby. This memorandum came to be known as the Rumple Report.