Nathan's spot on,
the job of the scruteener is to ensure the bike and safety equipment complies with the rule book, as a level 2 scruteener i don't go looking for anything else, if I see something I will bring it to the riders attention, but it's not my job to not allow them to ride if they have a dent in their rim.
As a level 2 clerk of course, If a rider came to see me because the scruteener said he/she couldn't ride because 2 of their spokes sounded different, I would have to over rule the scruteener and let them ride(then toddle back to the scruteener and tell them to find a reason that IS in the book ie maybe thier numbers aren't the right size)
TM,
their are 4 levels of official's
Level 1 are able to assist.
Level 2 came run a club event
Level 3 does National Title events
Level 4 does World titles
12.8.9.2 Valve caps must be fitted for all competitions
Ji,
Depends what the supp regs say.