There are alot of big psych words thrown around - bipolar, narcissism, pathological, sociopath .. attention-seeking.
As a professional psychologist and psychiatrist, I strongly disapprove diagnosing people with various diseases without personally examining them, but we are all free to speculate. This goes for professionals as well as laymen. I want to clear some things up. I don't claim to know it all, I would just like a healthy discussion.
Is Casey A Narcissist?
Description: Narcissism is extreme self-love. Narcissists often think about marrying themselves, admire themselves, feel like they are the center of the world, even when they are denied. They have trouble empathizing and rationalize their wrong behavior even if it takes disregarding logic. That being said, it's not always a bad thing. Narcissism is very common in great leaders, innovators, etc. There is no connection between this personality and violence. Attention seeking is not narcissistic. Narcissists are actually almost NEVER insecure. They do not feel the need to lie, because they already think they are the best. They are not ashamed of their actions. Thus, they often don't sense when they are hurting others.
My Opinion: I do not believe she is any more narcissistic than other people. She seems to lack empathy, but this trait is not exclusively for narcissists. She does seek attention, twist words and tries to make puzzles out of everything. A true narcissist would not go so far to lie. They would probably be proud of something like murder.
Is Casey Bi-Polar?
Description: Bi-polar disorder is a depressive disorder. It can be identified when 2 things are present: Long bouts of depression, and manic high-energy moments. The most common type of bipolar sufferer experiences mostly depression, with one or 2 manic attacks in their lifetime. They will be considered "depressed" by a layman but they still have the biological disease called Bi-polar. There are other types, but this is the most common.
My Opinion: No, she is not. I haven't seen any evidence of extended periods of depression. Depressed people don't like to party, be around others, etc.
Lastly, I am surprised the Psychologists on NG don't speak up about this. Polygraphs (or any saline-related lie detectors) are only 61% accurate - a bit higher than chance. Over 30 states do not allow them to be admissible in court. In Flordia, unless both parties agree 100% on evidence, polygraphs cannot be used in court. It seems very backwards that they are putting so much emphasis on an outdated technology. They are useful to speed up criminal investigations, but personally, I would not take a polygraph except in an emergency. It is not accurate enough.