As of August 2011, 31 states had approved legislation to enact "concussional awareness programs" in high school and youth sports, and 12 states were considering legislation. The enacted programs require specific equipment standards, the intervention of coaches and trainers who must assess concussional episodes for student athletes and restrict their activity, and athlete program testing following concussional episodes. Some individual state programs take it a step further and also include a field evaluation component that requires Gmax testing for field attenuation.
Gmax testing is a standard measure of the safety of athletic fields. It involves measuring the shock absorbing properties of a playing surface and comparing the results to an industry standard set by the American Society for Testing and Materials (ASTM). Harder surfaces will increase the amount of impact absorbed by the body, which results in a higher Gmax rating. Scores over 200 are considered dangerous and increase the risk of life threatening head injuries. Preferred Gmax scores should be in the 120-150 range.