The North Carolina law is found at subsection 23 of Section 115C-12 of the North Carolina Code, which falls under the title for elementary and secondary education and under the title for the state board of education. (N.C. Gen. Stat. ยง 115C-12(23)).
North Carolina law requires that the State Board of Education develop rules for interscholastic athletic activities. For middle and high schools, the rules must provide that coaches, nurses, volunteers, and students, among others, receive an annual concussion information sheet, which must be signed by the student and returned before the student may participate. If a student participating in interscholastic athletic activities is suspected of sustaining a concussion, the student must be immediately removed and may not return that day and may not return to play until evaluated by a licensed medical professional and given written clearance.
Subsection 23 of section 115C-12 of North Carolina Code is available online at:
http://www.ncleg.net/gascripts/statutes/statutelookup.pl?statute=115c-12
The following website offers additional information regarding North Carolina concussion law:
http://www.nchsaa.org/health-and-safety/gfeller-waller-concussion-awareness-act