Board Thread:Naruto Discussions/@comment-29857886-20160904193151/@comment-25093611-20160906160457

they should affect them, it is only that they can immediatly realize that they are in a genjutsu via chakra-distubing which other shinobi wouldnt be able to sense,

in a way they are very hard to fool due to the byakugan, but they can still be captured, and if the user is as good as itachi than they can keep the user trapped in a non-tsukyomi genjutsu despite the latter trying to escape :D