If any part of the players body is out of bounds WHEN he touches the ball, then yes, the play is dead, even if the ball is still in bounds.

If a player goes out of bounds and comes back in bounds to touch the ball, then it is illegal only if he is the first player to touch the ball. In this case, a flag would be thrown, but the play would not be dead.

A receiver can not go out of bounds and come back in to catch a pass, but he can go out of bounds and come back in to catch a pass off a deflection.

A kick returner can intentionally step out of bounds while the ball is STILL IN BOUNDS, and pick up the ball, and it will be ruled an illegal kick (as in the ball went out of bounds, even if it never does), and the ball will be placed at the 40 yard line. I've seen Wes Welker do this at least 4 times for the Dolphins.

No - the ball has to be entirely over the line to be out, and it doesn't matter where the player is.

OOPS! I thouhgt this was England Football.. not American. American football changes their rules every week anyway...

American football players can't leave the field and reenter during aplay, correct?

If you are talking about a pass..........a reciever that runs out of bounds cannot be the first player to touch the ball once he comes back in bounds or there will be a penalty flag thrown. The is basically dead because any yards you gain from that will be taken back.

Actually it depends on if the player was forced out of bounds or runs out oh his own.

In most cases in the NFL a player can not come back in and touch the ball or the play is considered dead.

If it were to hit him in the back then the ball would still be in play.

A ball is till alive even if it is out of bounds as long as it is in the air you can grab it like most great receivers do and keep two feet in bounds.

The ball is not considered dead unless someone is on the ground out of bounds and has possesion of the football, that is why when they punt to someone's end zone they try to tip the ball back by diving or jumping into the end zone when the ball is in the end zone BUT in the air! to the 1 yard line to give them horrible field position.

yes

It depends upon the situation. If he's a receiver who was bumped out of bounds by a defender for instance, as long as he returns immediately to the field of play, he can catch a pass. If he remains out of bounds and it touches him, the ball is dead in team possession. It also depends upon the level of play. In the NFL, the above described situation is not possible, for once a man is bumped out of bounds, he's ineligible.