I just stumbled on 'Your Company’s Culture is Who You Hire, Fire, and Promote' by Dr. Cameron Sepah, and found his thoughts and advice on values to assess during an interview to be excellent!
Not only that, but he also links to a fantastic spreadsheet for download covering Traits to Assess During an Interview.
The moment that leaders start weighing values-congruent against values-incongruent behavior, as if they balance out, is the moment when they have compromised their values.
This is most certainly a must read!