Wis. Stat. § 125.039: Civil liability exemption for retaining proofs of age.

No person who holds a license or permit and no employee of such a person is civilly liable for retaining a document presented as proof of age for a reasonable length of time in a good faith effort to determine whether the person who presented the document is an underage person or to notify a law enforcement authority of a suspected violation of s. 125.085 (3) (a) or (b).