I would think this SHOULD be the timing company. The scorer is an official in the rule book (not all officials have to be registered officials). Hy-Tek makes it very easy to check the number of events each person competed.I don't know it certainly shouldn't be the timing company (they should update runners in results if officals marked on the relay card) as far as I know there is no official looking at that. My guess only way that someone would be caught running 5 events is by another team's coach.
Though, like I said, without some help from the clerks, it's hard to verify relay names are correct.