225.17. A defendant may defeat an action by proving that, at the time of the transaction, the plaintiff knew that the document or public oral statement contained a misrepresentation or was aware of the material change that should have been disclosed.
An action may also be defeated by proving that the defendant conducted or caused to be conducted a reasonable investigation and had no reasonable grounds to believe that the document or public oral statement would contain a misrepresentation or that the failure to make timely disclosure would occur.