Undetectable Alignment

(Player's Handbook v.3.5, page 297, DnD 3.5)

Abjuration

Level: ; Bard 1; Cleric 2; Paladin 2; Dread Necromancer 1; Ebonmar Infiltrator 2; Vassal of Bahamut 2; Knight of the Chalice 2; Vigilante 1; Beguiler 1; Death Master 2; Jester 2; , Liberation 2
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature or object
Duration: 24 hours
Saving Throw: Will negates (object)
Spell Resistance: Yes (object)

An undetectable alignment spell conceals the alignment of an object or a creature from all forms of divination.