A priest who casts this spell is immediately able to determine if the subject creature deliberately and knowingly speaks a lie. It does not reveal the truth, uncover unintentional inaccuracies, or necessarily reveal evasions. The subject receives a saving throw vs. spell, which is adjusted only by the Wisdom of the caster—for example, if the caster has a Wisdom of 18, the subject's saving throw roll is reduced by 4 (see Table 5: Wisdom).
The material component for the detect lie spell is one gp worth of gold dust.
The spell's reverse, undetectable lie, prevents the magical detection of lies spoken by the creature for 24 hours.
The reverse requires brass dust as its material component.
Notes: Common for priests and druids (PHB).