Hypothetical: Two fusiliers are attempting to unmask an enemy IMP1 marker. Fusilier #1 attempts to discover and fails. Fusilier number #2 then attempts to discover and succeeds, flipping the enemy to the IMP2 state. Can fusilier #1 now attempt a new discover roll against the IMP2 marker? I believe this was raised in an old forum thread (http://infinitytheforums.com/forum/topic/46715-dicoverdiscover-against-imp1/ ) where IJW notes that the IMP2 marker is a new marker (so a new discover roll can be made even if a model failed a roll against the previous IMP1 marker), but the subsequent follow up question about whether the impersonation rules are inconsistent with the general discover rules in the same thread was never resolved.
I don't think you could discover the new impersonation marker because it's still the same impersonator "If an enemy fails his Discover Roll, that enemy cannot attempt to Discover the same impersonator until the next (Active or Reactive) Turn." This is a different restriction to the base restriction on discovering the same marker multiple times, I think it would even apply if you fully revealed the impersonator and then he re-impersonated entering IMP-1 again.
Yep, the rules for Discover and Impersonation are inconsistent. Generally I'd assume the specific overrides the general, but IJW was pretty clear in the thread that I linked.
I have to note that if in that "specific over general" the Discover skill is "specific", then its first bullet would make two levels of Impersonation state useless: it says that if Discoverer passes his WIP roll, then the target "is no longer represented with a Camouflage, TO Camouflage, Impersonation (...) Marker, and must be represented by the actual Trooper model or Weapon or Equipment Marker" - not another IMP marker. Thus, I'd say that it's the state (Camo, TO, Impersonation) rules that are "specific" and Discover is "general".
IJW didn't really answer the question you asked in the thread you linked (he just essentially said a discovered IMP1 marker is replaced by an IMP2 marker). He answered a similar question about double discover here though http://infinitytheforums.com/forum/topic/44258-discover-discover-vs-impersonator/?page=1 with essentially the same answer Spleen gave you. Once a trooper fails to discover an Impersonator, the same troop can't discover the same Impersonator again in the same turn. As clearly stated in the Impersonator state rules.
In another thread there was a conclusion that the model is still the same impersonator, even with two different marker states. So you cannot discover it if you failed once. I tried to ask for definition what exactly a impersonator is. To my knowledge, it is the only case where the marker state is overridden by a rule that sums up two marker states to one new something.
