A 532 [correction] Yes.
Quote Originally Posted by Banaticus View Post
Usually not, because you aren't actually casting a spell from a spell-trigger or spell-completion device, you're triggering or completing it.
Dungeon Master's Guide is the primary source for magic items. From page 211:
Scrolls: A scroll is a spell magically inscribed onto paper or parchment so that it can be used later. A scroll of searing light allows a cleric to cast searing light once, as though she had prepared the spell herself, except that any level-based effects—such as range and damage—are based on the level of the scroll’s creator, not the user’s caster level.
Wands: A wand is a short stick imbued with the power to cast a specific spell. A wand of magic missile is a useful weapon for a wizard or sorcerer. A newly created wand has 50 charges, and each use of the wand depletes one of those charges.
From page 243:
Activation: Staffs use the spell trigger activation method, so casting a spell from a staff is usually a standard action that doesn’t provoke attacks of opportunity.
From page 245:
Activation: Wands use the spell trigger activation method, so casting a spell from a wand is usually a standard action that doesn’t provoke attacks of opportunity.
Activating a spell from any spell completion (scroll) or spell trigger (wand/staff) item is explicitly stated to be casting that spell.