Discern Lies

(Player's Handbook v.3.5, page 221, DnD 3.5)

Divination

Level: ; Cleric 4; Paladin 3; Vassal of Bahamut 3; Knight of the Chalice 4; Savant 4; , Inquisition 4, ; , Mechanus 4, ; , Drow 4, ; , Mind 4, ; , Nobility 4, ; , Tyranny 3
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature/level, no two of which can be more than 30 ft. apart
Duration: Concentration, up to 1 round/level
Saving Throw: Will negates
Spell Resistance: No

Each round, you concentrate on one subject, who must be within range.
You know if the subject deliberately and knowingly speaks a lie by discerning disturbances in its aura caused by lying.
The spell does not reveal the truth, uncover unintentional inaccuracies, or necessarily reveal evasions.
Each round, you may concentrate on a different subject.