My daughter is a master deceiver. I've gotten to the point with her that, unless there is visible proof, caught-in-the-act, video, photo, voice recording (OK, I'm joking a bit ) -- if I can't prove it for certain, she will deny it. And a part of me believes it. Sort of. Like, from all of the items she's stolen, I would assume she's on some sort of drug. She insists that she's not, and she rarely smokes weed (her doctor). She will insist this vehemently. To the point where you believe her--question yourself--even though you really don't. She's always throwing multiple kinds of smoke. I'm guessing this is just another of those lovely attributes of an addict, and that many of us have experienced it. I hate it, though. It has conditioned me to live in a slightly skewed reality, cynical and confused.