[BillyMac]

NFHS 7-1-1: A player is out of bounds when he/she touches the floor, or any object other than a player/person, on or outside a boundary. For location of a player in the air.
NFHS 7-1-2: The ball is out of bounds:
a. When it touches or is touched by:
1. A player who is out of bounds.
2. Any other person, the floor, or any object on or outside a boundary.
3. The supports or back of the backboard.
4. The ceiling, overhead equipment or supports.
b. When it passes over a rectangular backboard.
NFHS 7-2-1: The ball is caused to go out of bounds by the last player in bounds to touch it or be touched by it, unless the ball touches a player who is out of bounds prior to touching something out of bounds other than a player.
NFHS 7-2-2: If the ball is out of bounds because of touching or being touched by a player who is on or outside a boundary line, such player causes it to go out.

Good time for a reminder. If A1 is dribbling near the sideline, and his jersey touches a chair that's out of bounds, then A1 is out of bounds. However, if A1 is dribbling near a sideline, and his jersey touches, in turn, a coach, a cheerleader, an official, and finally, a fan, who are all out of bounds, then there is no out of bounds violation. Tricky, but still, nevertheless, true.