Board Thread:Versus Debates/@comment-26127155-20150807124703/@comment-734582-20150808131123

Sasukeuzumaki22 wrote: oh ok i think i get it, but i doubt kishi would make something like that with no risks or draw backs for example how many times can it be used, chakra requirements and perhaps a weakness Judging from similar techniques, the weaknesses are:


 * like any MS ability (and scaling with power): Huge drain in chakra, high requirement of concentration and limited use. A crow could only use the eye once in 10 years. Danzo with his bodyhack could use it more often but also needed significant recharge time (Which is why he stalled his fight with Sasuke in stead of ramming a sword through his throat).


 * Third parties. Unlike Tsukuyome, it can be broken by an observant third party


 * (Possibly) Conflicting experiences, though more likely to be new conflicting experiences. So, over time the Genjutsu would wear off as the affected would be able to peel away at the falsehoods.

Because of the above, Kakashi's little shadowclone trick would indeed work. I don't believe it works without eye contact, so that's another.