Philter of Glibness: This potion enables the imbiber to speak fluently—even tell lies—smoothly, believably, and undetectably. Magical investigation (such as the 4th-level priest spell, detect lie) will not give the usual results, but will reveal that some minor "stretching of the truth" might be occurring.
Encyclopedia Magica[]
This philter enables the imbiber to speak fluently-even tell lies-smoothly, believably, and undetectably. Magical investigation (such as the 4th-level priest spell, detect lie) does not give the usual results, but reveals that some minor “stretching of the truth” might be happening. If a Charlatan (a bard kit) imbibes this philter, even detect lie has only a 5% chance to note any “stretching of the truth.”