State law addresses concussions/return to play.
Kansas Statutes 72-7119. School sports head injury prevention act.
(e) If a school athlete suffers, or is suspected of having suffered, a concussion or head injury during a sport competition or practice session, such school athlete immediately shall be removed from the sport competition or practice session. (f) Any school athlete who has been removed from a sport competition or practice session shall not return to competition or practice until the athlete is evaluated by a health care provider and the health care provider provides such athlete a written clearance to return to play or practice. If the health care provider who provides the clearance to return to play or practice is not an employee of the school district, such health care provider shall not be liable for civil damages resulting from any act or omission in the rendering of such care, other than acts or omissions constituting gross negligence or willful or wanton misconduct.