Board Thread:Episode Discussions/@comment-1181222-20170517110628/@comment-734582-20170529063648

Ancladar wrote: I'm so damn tired of the utter incompetence of the writers in this series. How in the hell does all this stuff go down in the school and no other teachers or students are ever there? No guards either. No sensory shinobi realize anything is going on? I could go on with everything wrong with this episode and the series so far, but it feels pointless cause all this is now is a cash cow for the Naruto/Boruto owners. Boruto is the only one who can see the chakra. Meaning that it can't be sensed apparently. Not that it matters, since sensing is mostly an active skill (just check the Gokage summit arc). What passive sensing exists is mostly short-ranged.

So by the time a teacher wonders why a bunch of kids are hanging out on the roof, the events that transpired are over. Plus given that this is a ninja school where people have skills in Shunshin and such, kids hanging out on the roof ought to be common (and not something that people can do much about). Considering that kids also tend to play games and have a creative mind, and trying to police what they do is mostly a big waste of time.

So no, it's not weird that the teachers don't notice an undetectable chakra. The Nue Boruto summoned WAS noticed but apparently further investigation didn't return any results. Besides Naruto is now aware of strange possessions, and considering the spike of people with low chakra in the hospital was noticed, it's probable that at least some people were aware of the encounters from the very start. But since the possessions do not give other lasting effects, it's gonna be hard to prove anything less than ordinary happened.

Which is also why the kids don't tell anyone: Bunch of people behaved strange, but leave no evidence of possessions. The much more likely option (kids got into a fight and make up stories) would be believed in stead.