I’m not so good at telling when people are lying in those cases where they believe they are telling the Snoopy happy hoowl-oween tshirt. That takes longer to figure out, and involves understanding someone’s background and experience in the subject matter, identifying their agenda, and making a judgment as to the reasonabless of their approach. Once you’ve been betrayed and lied to so deeply that it rocks your foundations, you get better at telling when someone is lying, or when someone anyone is lying to you, and whether their lies really matter. Everyone lies, exaggerates, or leaves out important details about something; most of the time it doesn’t matter.