Interesting "debate", even the pros get it wrong from time to time!
Here's the exert from the good book...
A throw-in is a method of restarting play.
A throw-in is awarded to the opponents of the player who last touched the ball when the whole of the ball crosses the touch line, either on the ground or in the air.
A goal cannot be scored directly from a throw-in.
Procedure - At the moment of delivering the ball, the thrower:
• faces the field of play
• has part of each foot either on the touch line or on the ground outside the touch line
• holds the ball with both hands
• delivers the ball from behind and over his head
• delivers the ball from the point where it left the field of play
All opponents must stand no less than 2 m (2 yds) from the point at which the throw-in is taken.
The ball is in play when it enters the field of play.
After delivering the ball, the thrower must not touch the ball again until it has touched another player.
Referees are reminded that opponents may be no closer than 2 m from the point at which the throw-in is taken. Where necessary, the referee must warn any player within this distance before the throw-in is taken and caution the player if he subsequently fails to retreat to the correct distance. Play is restarted with a throw-in. If a player, while correctly taking a throw-in, intentionally throws the ball at an opponent in order to play the ball again but neither in a careless nor a reckless manner nor using excessive force, the referee must allow play to continue.
If the ball enters the opponents’ goal directly from a throw-in, the referee must award a goal kick. If the ball enters the thrower’s own goal directly from a throw-in, the referee must award a corner kick. If the ball touches the ground before entering the field of play, the throw-in is retaken by the same team from the same position provided that it was taken in line with the correct procedure. If the throw-in is not taken in line with the correct procedure, it is retaken by the opposing team.
---
This bit is interesting for me "If a player, while correctly taking a throw-in, intentionally throws the ball at an opponent in order to play the ball again, but neither in a careless nor a reckless manner nor using excessive force, the referee must allow play to continue." Surely a grey area of interpretation?
There's a kid in my son's U13s team, his throws would be the prime definition of "ugly". More often than not his release action gives you the impression his arms are interconnected with his waist. As he brings the ball over his head, he leans significantly forward, sometimes at an angle of almost 90 degrees and staring at the ground before releasing. Regularly brings a shout of "foul throw" from opposition players/coaches, looks wrong, but according to the laws isn't because there's no mention of a maximum angle the body can lean forward before release and even though he's staring at the floor, he's still technically facing the field of play!