Wisconsin Statutes Employment, Compensation and Mining (Ch. 101 to 109) § 103.73. Form and requisites of permit; as evidence

(a) Such evidence as is required by the department showing the age of the minor. The department shall promulgate rules governing the proof of age of minors who apply for labor permits that shall bind all persons authorized by law to issue such permits. In promulgating those rules, the department shall include a requirement that the department and its permit officers shall accept as evidence of a minor's age a duly attested birth certificate, a verified baptismal certificate, a valid operator's license issued under ch. 343 that contains the photograph of the license holder or an identification card issued under s. 343.50. Those rules shall also require the department and its permit officers to accept as evidence of a minor's age a valid operator's license issued under ch. 343 that contains the photograph of the license holder or an identification card issued under s. 343.50 without requiring proof that the minor's birth certificate or baptismal certificate cannot be secured.

(b) A letter written on the regular letterhead or other business paper used by the person who desires to employ the minor, stating the intention of the person to employ the minor and signed by the person or someone duly authorized by the person.