Hands Up or Hands Down?

[nrose24]

I saw a few comments about if it was legal for the hands to be out, i.e. not vertical, and questioning if it was in the rule book. I have looked and cannot find it either. When I brought it up at an association meeting last night, EVERYONE there said it was not legal, but nobody could tell me where it was in the rule book.

So, I would like to know if anyone on here can point out in the rule book where this is restricted, or if anyone actually restricts players from doing it in the game.