Ill. Admin. Code tit. 11 § 1415.15
No horse will be permitted to start at a pari-mutuel race meeting unless it has been tattooed on the upper lip with an identification number or implanted with an electronic horse identification microchip that accurately identifies the horse and is compliant with the international standards (International Organization for Standardization, ISO Central Secretariat, 1, ch. De la Voie-Creuse, CP 56, CH-1211 Geneva 20 Switzerland, ISO Standard 11784:1996, no later editions or amendments). However, the requirement of a lip tattoo shall not apply to horses entered in stakes races when the horses are fully identified pursuant to Section 1415.10 and when the horses have raced at pari-mutuel race meetings outside of North America.
Ill. Admin. Code tit. 11, § 1415.15
Amended at 35 Ill. Reg. 16733, effective October 1, 2011