You enchant a 20-ft area as zone that rejects the truth. Anyone inside of this zone or any who enter must make a CHA save or be affected. A failed save results in the target being forced to lie for the duration of the spell. The cannot intentionally tell the truth, although they are aware of this and can change their answers to avoid the crippling mental anguish they would receive from telling the truth. 

You can tell if someone passes their saving throw.

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This spell is an alteration of the Spell Zone of truth. This corruption of the spell  was created by the mad wizard Dacluwn