Just to clarify a few bits:
DeMarte testified DeVault was antisocial, not a psychopath. Whether or not they're one in the same is really a huge matter of debate. Psychopathy isn't recognized by the ICD or DSM V as a mental health disease or disorder. Dr. Robert Hare, the predominant authority on psychopathy, states while most psychopaths would test high for antisocial personality disorder, not all antisocials would or do test high for psychopathy.
I personally believe a psychopath to often be a blend of the recognized disorders. I 'see' evidence of narcissistic and antisocial personality disorders in Jodi without a doubt - if I stretch, I can see how borderline fits in. I just think she's a lot less borderline than she is narcissistic. This is just my opinion based on personal experience. Undoubtedly, she's a psychopath - it's really just a question of what recognized disorders are at play that contribute to her psychopathy. (FTR, I don't believe DeVault is though she clearly is antisocial...or, rather, nothing near the level of psychopathy Jodi is at. Jodi is off the charts psychopathic.)
Psychopath deviate (as part of the MMPI scales) has nothing to do with psychopathy itself. It's basically a way of measuring how the patient responds to rules; their necessity for control, etc.
While the MMPI is based on self-reporting and could be skewed, I believe it's written in such a way that malingering would be evident, if memory serves. With all diagnoses of cluster B personality disorders, it's often a 'best fit' approach...cluster B's are very often comorbid which can make diagnosis difficult.
As I've stated, for so many reasons, I really hate that Jodi is being equated to someone 'just' borderline because, if she truly is just borderline, she's incredibly atypical.
JMO and FWIW