Wednesday, January 18, 2012 The official jam clock must be highly visible to referees, teams and fans.

Just like the rule for the official period clock, which I covered last week, the official jam clock must be highly visible. As well, just like with the period clock, the jam clock that is visible is the official jam clock. This means that if a jam timer is timing jams on their own stopwatch, assuming it isn't called off by a Lead Jammer, the jam is over when the visible jam clock reaches zero, not when the jam timer's stopwatch reaches zero. The reasoning behind this because nobody else can see the jam timer's stopwatch, yet a team may rely on there being time left in a jam to score points. Even if the visible jam clock began three seconds after the jam start whistle, if a Jammer see three seconds left in a jam but hears the jam end, that's a problem. So the visible jam clock must start on the jam timer's jam start whistle, and the jam timer must end two minute jams only when the visible jam clock reaches zero.