When the whole of the ball passes over the touchline, either on the ground or in the air, it shall be thrown in from the point where it crossed the line, in any direction, by a player of the team opposite to that of the player who last touched it. The thrower at the moment of delivering the ball must face the field of play and past of each foot shall either be on the touchline or on the ground outside the touchline. The thrower shall use both hands and shall deliver the ball from behind and over his head. The ball shall be in play immediately it enters the field of play, but the thrower shall not again play the ball until it has been touched or played by another player. A goal shall not be scored direct from a throw in.
a) If the ball is improperly thrown in, the thrown in shall be taken by a player of the opposing team.
b) If the thrower plays the ball a second before it has been touched by another player, an indirect free-kick shall be taken by a player of the opposing team from the place where the infringement occurred, subject to the overriding conditions imposed in Law 13.