Rule 630. Puck Out of Sight and Illegal Puck

1. Should a scramble take place, or a player accidentally falls on the puck and the puck is out of sight of the Referee, he shall immediately blow his whistle and stop the play. The puck shall then be ``faced-off'' at the point where the play was stopped, unless otherwise provided for in the rules.

2. If, at any time while play is in progress, a puck other than the one officially in play shall appear on the playing surface, which interferes with the progress of the game, the play shall be stopped immediately.