Evidence of representation or legitimate interest may be either by individual authorization cards or by petition. In either case, the petition or card shall show the address and social security number of, and be signed and dated by, the employee expressing an intent to be represented by a specific employee organization. A card or petition signed and dated by an agricultural employee less than one-hundred eighty days prior to the date on which the petition was filed shall constitute prima facie evidence of continuation of such authorization.
Kan. Admin. Regs. § 12-2-4