Article II, Section 10 of the TSSAA Bylaws states: It is required that no student be permitted to participate in practice sessions or in athletic contests until there is on file with the principal a preparticipation medical evaluation form signed by a doctor of medicine, osteopathic physician, physician assistant, or certified nurse practitioner stating that the student has passed a physical examination, not prior to April 15, and that in their opinion the student is physically fit to participate in interscholastic athletics.