From the moment the league opened in 1967, it’s been the job of its owners to ensure the safety of its players.

As long as players are allowed to practice, attend games and participate in social activities, the NFL is free to protect the game’s reputation, while also maintaining the league’s business.

In order to protect its players, the league has developed an extensive and diverse list of rules that regulate everything from helmet use to head injuries to concussions.

Here’s a look at some of the more notable rules and how they apply to the NFL: Helmet Use: Head injuries are treated as a “domestic violence” offense under the NFL’s “Hazardous Substances” policy.

Players are required to wear a helmet that’s at least four inches (10 centimeters) thick and to wear it during games.

The league says helmets are only required for players under the age of 18, who are not allowed to participate in certain activities such as tailgating or participating in the Super Bowl.

The rule is intended to protect players from the possibility of severe head injuries and, in the event a player’s head gets caught in the helmet, it must be replaced.

If a player suffers a concussion, a league-mandated examination must be performed and if the results are positive, the player is required to return to the field of play.

A player who is diagnosed with a concussion is required by law to undergo an evaluation, which typically involves an MRI, CT scan and X-rays, in order to determine whether the concussion has affected his ability to perform at a high level.

In the case of concussions, a team may have to play out the game and the player who was hit by the ball will be allowed to return the ball and play in the next game.

Concussions can also lead to reduced level of performance, which is why a concussion may not be considered a “serious injury” for a player who has had at least one other concussion in the previous five years.

Concussion Risk Assessment: A concussion is considered a serious injury in the NFL if it results in a player losing at least 10 percent of his or her activity level.

A concussion can be treated by a team medical team, and it’s up to the team medical staff to decide whether to allow the player to return or keep the player on the field until the team determines that the player can return to practice.

The NFL’s concussion protocol, which applies to all professional sports, states that a player is considered to have a concussion if he or she has: a concussion (within the last five years) which has affected performance;

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