A jail administrator's laptop computer introduced the virus that shut down the Marion County Jail's computer system for much of last weekend.
Sheriff Jimmy Shinn said it had been common practice for jail supervisors to take a laptop home in order to monitor cameras at the jail.
"We are thinking that laptop got infected at her house," he said. "When she brought it back over to the jail or was wired into the Lawman Records Management System, that's when (the jail computer system) got corrupted."
Shinn will no longer allow supervisors to take computers outside the building. "I can't take the chance on getting them infected and bringing them back into our system at the jail," he said.
As of late Tuesday morning, 98 percent of the data had been recovered. Shinn was confident that the remainder of the files would also be found.
Among the items recovered were evidence photos and prisoner booking photos. "Getting them back was a big relief," Shinn said.
Many of the officer reports filed Saturday through Monday had to be redone.
Shinn estimated it will cost of repairing the system will take several thousand dollars from the jail's computer budget. "I won't have to ask the (county) commission for more funds," he said.
The virus struck at approximately 3 a.m. Saturday and "wiped out everything," Shinn said Monday.