UPDATE: WTHI-TV has more here. Their reporting indicates that Decker's bust stems from a federal drug bust last December. The report says:
"We learned about other people involved in the drug trafficking organization. David Decker was one of those people. We were able to document through informant testimony and cellular telephone records that he'd participated in a drug delivery on November 8," Assistant U.S. Attorney Brad Blackington said.
This case was investigated by the FBI, Bureau of Alcohol, Tobacco, and Firearms, Vigo County Drug Task Force, the Vincennes Police Department and Indiana State Police.Officials said the deal went down in November 2008, less than a week after his re-election to the county office.
The agreement calls for Decker to serve 10 months in prison and he will have to resign his position as a county commissioner. The plea still needs to be signed off on by a judge. The court has the option to accept of reject the agreement.