Question: I see a lot of players lowering their shoulder and then raising it into the another player as they make contact during a shoulder charge. Some refs call it a foul and others have said it is a legal charge. Is it foul for a player to lower their shoulder into another player during a shoulder charge?

Answer (May 3, 2013):
There is no clear definition in the Laws of the game as to what is fair in a shoulder-to-shoulder charge. The general definition is given in the USSF Advice to Referees:

12.5 CHARGING
The act of charging an opponent can be performed without it being called as a foul. Although the fair charge is commonly defined as “shoulder to shoulder,” this is not a requirement and, at certain age levels where heights may vary greatly, may not even be possible. Furthermore, under many circumstances, a charge may often result in the player against whom it is placed falling to the ground (a consequence, as before, of players differing in weight or strength). The Law does require that the charge be directed toward the area of the shoulder and not toward the center of the opponent’s back (the spinal area): in such a case, the referee should recognize that such a charge is at minimum reckless and potentially even violent.

It may help to include some more information:
We define charging thusly: A fair charge is shoulder to shoulder, elbows (on the contact side) against the body, with each player having at least one foot on the ground and both attempting to gain control of the ball. The amount of force allowed is relative to the age and experience of the players, but should never be excessive. This is as defined by the referee on the game, not some book definition, adjusted as necessary for the age and experience of the players and what has happened or is happening in this particular game on this particular day at this particular moment. It all boils down to what is best for the referee’s management and the players’ full enjoyment of the game.

Although often overlooked by spectators, it is important to remember that a player’s natural endowments (speed, strength, height, heft, etc.) may be superior to that of the opponent who is competing with that player for the ball. As a completely natural result, the opponent may not only be bested in the challenge but may in fact wind up on the ground with no foul having been committed. The mere fact that a player fails in a challenge and falls or is knocked down is what the game is all about (and why coaches must choose carefully in determining which player marks which opponent). Referees do not handicap players by saddling them with artificial responsibilities to be easy on an opponent simply because they are better physically endowed in some way.

Fair charges include actions which do not strictly meet the “shoulder-to-shoulder” requirement when this is not possible because of disparities in height or body type (a common occurrence in youth matches in the early teenage range where growth spurts differ greatly on an individual level within the age group). Additionally, a fair charge can be directed toward the back of the shoulder if the opponent is shielding the ball, provided it is not done dangerously and never to the spinal area.

The arms may not be used at all, other than for balanceÑwhich does not include pushing off or holding the opponent.

Children of the same age differ in their development. They and we have to live with it. No foul if there was no offense other than being larger or faster. As noted above, the decision as to whether the force used is excessive is up to the individual referee.

And let’s also add that if the use of the shoulder appears to the referee to involve the use of excessive force, then it should be punished with the sending-off of the miscreant.…