New IPG, player A controls player B, Missed trigger on Inventor's Fair = Detrimential?
P: “but I'm allowed to miss his triggers!”
J: “you think it's OK to make mistakes on purpose?”
P: “Oh, well … if you put it that way … no, I guess not.”
That's the most likely direction that investigation would take. The concern is the player who knows they shouldn't miss their own triggers (and, by extension, triggers of a player they control), but do so anyway, to gain advantage, … and then pretend ignorance to “cover up” their Cheat.
I think it's far more common for players to be ignorant of this policy, esp. as it's a fairly recent shift. (Too) many players still think it's OK to let their opponent make mistakes, even GRVs - i.e., they extend the skill-testing aspect of Missed Trigger to other infractions.
When investigating, you really just need to satisfy your curiosity, to determine the credibility of the player's statement (that they thought it was OK, or at least not illegal). I'll admit, it's going to be unusual that you poke a bit at the edges of their story and determine that, in fact, they know very well that they just Cheated - but it's still worth a question or two, because those exceptions do occur. (Please, don't spend 5 minutes on such an investigation!)
Consider a very plausible and possible response from a player: “Yeah, I think it's kinda scummy to let him miss his triggers, but it's still legal!” - that player isn't Cheating, because they aren't intentionally violating policy; instead, they're doing what they think is allowed - even if their instincts are trying to guide them to correct behavior.
d:^D