CIF State Information Regarding Concussions:

Nation wide data continues to show that many catastrophic head injuries are a direct result of injured athletes returning to play too soon, not having fully recovered from the first head injury. Additionally, the Centers for Disease Control reports that approximately 3 million sports and recreational concussions occur every year. California law mandates that all coaches must receive training on concussions. The training may be fulfilled through the free, online course available through the National Federation of State High School Associations (NFHS). Additionally, California law mandates that all CIF member schools must comply with the following: On a yearly basis, a concussion and head injury information sheet shall be signed and returned by the athlete and the athlete's parent or guardian before the athlete's initiating practice or competition.

Bylaw 313 
A student-athlete who is suspected of sustaining a concussion or head injury in a practice or game shall be removed from competition at that time for the remainder of the day.  A student-athlete who has been removed from play may not return to play until the athlete is evaluated by a licensed health care provider trained in the evaluation and management of concussion and receives written clearance to return to play from that health care provider.