Law 9B1{a} says "The Director should be summoned at once when attention is drawn to an irregularity." So if the Director is not summoned, it would seem we have an infraction of law. However...
Law 9B1{b} says "Any player, including dummy, may summon the Director after attention has been drawn to an irregularity." So any player who does not summon the director has not done anything wrong.
Frankly, if an irregularity occurs, and nobody calls the director at the time, but later it becomes a big problem, I might like to penalize somebody, or everybody, for not calling in the first place. But if nobody has done anything wrong, I can't do that. So how should these two laws in conjunction be interpreted?

Note that Law 9B1{a} was changed from "must" in the 1997 laws to "should" in the 2007/2008 laws. That, I'm sorry to say, was my fault.
