Board Thread:Spoilers!/@comment-25613119-20150304154923/@comment-25375217-20150331162523

I think Emma's lie detector is related to her true love light magic. I just don't think she fully recognized it at that point. When Lily lied she was probably going in her head "is she lying to me? no she seems so sweet and she's just like me i can trust her". When Lily was revealed to be a liar Emma started to think "so i was right, she was lying. i could sense it." and that's when she found out she had a "superpower", and she got a job where she could use it, etc.