微表情也無法彌補這個落差。在 Porter 和 ten Brinke 的研究中,人們說謊時微表情並沒有比較多。在 Jordan 等人(2019)的對照實驗中,用一套知名的微表情訓練工具受訓的人,識破謊言的能力並沒有比接受假訓練或沒受訓的人好,而且整體正確率還略低於隨機猜測。Vrij、Hartwig 和 Granhag(2019)的一篇回顧指出,說謊時的非語言線索既微弱又不可靠。
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