In certain situations players in a match may need a 3rd party to watch a shot to ensure the shot being performed does not result in a foul.

Any player on the participating teams may officiate a shot. 

When officiating a shot it is recommended that a video camera be used and it is highly preferred that slow motion video be used. Slow motion video apps are available for Android, iPhone, and Windows Phone.

Any person's smart phone can be used for the video capture.

NOTE:  In the event a judgement can not be made during the officiating due to the fact that the contact of balls are to close to call, then tie goes to the shooter.

NOTE:  If the shooter proceeds with the next shot (after having been asked by the opponent to wait), it is a foul and the opponent is awarded ball-in-hand. If the opponent does not dispute the shot before the next shot is played, the shot cannot be questioned and is assumed legal.