Board Thread:Theories and Speculation/@comment-6963368-20150822025635/@comment-24553184-20150823215514

the thing is that boruto uses them in a tournament with rules, and this tools are banned, if naruto would forbid swords and boruto uses one than he obviously cheats, the same principle :)

I haven't seen all the movie or read the summary so I didn't know that was specifically against the rules XD