If any employee of the department, a county, or a tribal governing body reasonably suspects that fraudulent activity as described in sub. (1m) or (2) (b) has occurred or is occurring, the employee shall immediately report the facts and circumstances contributing to that suspicion to the employee’s immediate supervisor.

An immediate supervisor who receives a report under subd. 1. shall immediately evaluate the report to determine whether there is reason to suspect that the fraudulent activity has occurred or is occurring. If the immediate supervisor determines that there is reason to suspect that the fraudulent activity has occurred or is occurring, the immediate supervisor shall immediately report the facts and circumstances contributing to that suspicion to the unit of the department that is responsible for investigating suspected fraudulent activity under sub. (1m). If the immediate supervisor is an employee of the department or of a county having a population of 145,000 or more, the immediate supervisor shall also immediately report those facts and circumstances to the sheriff.

Except as provided in subd. 2., an immediate supervisor who receives a report under subd. 1. shall keep the identity of the reporter confidential. A sheriff or unit of the department that receives a report under subd. 2. shall keep the identity of the employee reporting under subd. 1. and the immediate supervisor reporting under subd. 2. confidential until the sheriff or unit determines that the report merits further investigation. If the sheriff or unit conducts a full investigation, the sheriff or unit shall keep the identity of that employee and immediate supervisor confidential if it is reasonably possible to do so. Any person who fails to report as required in subd. 1. or 2. may be required to forfeit not more than $1,000.