Due to Sansa's time with some of the scummiest and dishonest scoundrels in the Seven Kingdoms, she's picked up on some handy skills that allow her to usually tell when people are lying based on various tells and observations (as well as her own experiences).
But just so I don't step on anyone's toes with this sort of thing - because I know everyone has their own level of comfort as well as their own plots they want to do - I'm making this post so any potential/current cr can let me know what Sansa can pick up on (if anything).
Handwaving isn't something I like to rely on, but sometimes life happens, and it needs to be done, sadly. I do my best to keep to backtagging and staying on the ball, but in the case that can't be managed, I decided to make this post for keeping those details tracked for cr's ref and my own ref.
But also stating: this is not for major cr development. Those will be played out at my insistence or not at all. I'm willing to handwave some things, but def not those (which I'm sure we can all agree with that).