Indiana Code Title 21. Higher Education § 21-18-13-7

Sec. 7. A student athlete who has been removed from practice or play under section 6 of this chapter may not return to practice and play until the coach has received verbal permission from an athletic trainer or a physician that the student athlete may return to practice and play.  Within twenty-four (24) hours after giving verbal permission for the student athlete to return to practice and play, the athletic trainer or physician must provide the coach with a written statement that the student athlete has permission to return to practice and play.