I think it's much easier to spot an honest person, but everyone has their secrets. Your best bet is to find someone who seems trustworthy and give them occasion to lie.

[She grunts, once, when she gets gathered up into a non-sleeping hug, but doesn't fight it. After a moment, Waltaquin puts an arm around Psyche and rests her chin on the crown of her head.]

Coeurls don't change their pelts, Psyche. [Pity...she cannot look her in the face when she says this. But that's perhaps why she pulled her so close - she knew what she was about to say would feel like.] I couldn't make any promises even if you asked. Not long as we met, I told you I had every intention of doing as I pleased... but I won't make any foolish moves.