THE DECISION
The referee stops play and instructs the ball boy/girl to leave the field of play. Play is restarted with a dropped ball for one player of Team B as they would have had the throw-in if the ball had gone out of play. The ball is dropped at the position where the ball made contact with the ball boy/girl. A free kick cannot be awarded because the interference was caused by an outside agent, not by someone named on the team lists.
Read official Law 8 ↗