Yeah, I know. That's what I do. But its hard to always have to untrain new players ^^
Like, that should be a roll for the duke to deceive against the pasosve insight of the character. If there is one. And then you tell the player "the duke is avoding eye contact when he speaks about his dead wife" or something.
No roll needed. If it is plainly visible, their is no need for a roll. If it is hidden, the character has to do something to find it.
I know how the game works. I would take away most active rolls for insight and perception. Maybe there are some corner cases where they could be used, but mostly they should be passive.