Disclaimer: I never read past the Sasuke Retrieval Arc, so it is possible that my question may be answered if I had read further. However, I do believe that the Chunin Exam arc, which is what my question is about, is far enough from the Sasuke Retrieval Arc that my question would have already been answered by the time the story arrives at the Sasuke Retrieval Arc.
I will be referencing the part of the Chunin Exam Arc where the characters take the written portion of the exam. This is in volume 5 of the Naruto tankoban (which covers chapters 37 - 45).
During my trip down memory lane with my re-reading of what I have read of Naruto, this question occurred to me: how did so many characters get away with, at least to me, seemingly obvious, cheats during the written portion of the Chunin exam?
Here is a list of cheats in particular that went unnoticed that I would like to know how they managed to do so:
Akamaru was barking the answers to Kiba. We know that dogs are used a fair amount by skilled ninja, including Kakashi himself, so would it not be logical for the proctors to assume that a dog could be used to cheat? I can believe Shino's insect trick because ninja-insect interaction is much rarer than ninja-dog interaction since it is an ability exclusive to Shino's clan and also a fly buzzing is much more inaudible than a dog barking.
Naruto and Hinata were having a full-blown conversation, it was whispering, but still a conversation nonetheless. How did none of the proctors notice?
Also going along the lines of communication with other ninja in the room, how did Tenten manage to communicate to Rock Lee to raise his head band to notify her that he was able to see her mirrors in the ceiling/how did she communicate to him that the mirrors were even there without getting caught?
How did Tenten get those mirrors up in the ceiling undetected in the first place? I cannot imagine that it was done before the exam started, unless she was planning to cheat from the very start, without knowing what the exam was going to be like. I can believe Kankuro and his Crow cheat because it is much easier to set-up Crow as a proctor undetected in the masses of ninja in the room than it is to set-up a mirror system in the ceiling.
Ino's Mind Body Switch Technique requires hand seals. How did she get away with using it on Sakura without being seen? I would imagine that hand seals would be the very first thing that the proctors would look out for considering it is an exam for ninja.
Proctor Ibiki himself actually SEES Gaara making a hand gesture that could pass as a hand seal if the next panel had not revealed that he was just using that hand gesture to cover his eye so he could create the sand eye. But even so, Ibiki did claim to count "anything out of the ordinary" as cheating, and a suspicious hand gesture resembling a hand seal, I would say, qualifies as "out of the ordinary", so why did he not call Gaara out?
I realize that this last point is a bit too hypothetical and assumes too much, but we do know that there are ninja who can sense chakra usage. I do not recall this directly from the manga, but taking a look at Ino's Wiki page here, it says that she is one of such ninja (eventually, but that is not the point; I am just linking to show that there does exist chakra sensing ninja). Surely [I know, this is a large assumption here], there must be some proctor in the room who would have such an ability since it is a ninja exam, so why did no one detect the chakra expenditure that was going on in the room?