Approximately 1% of the human population fit the description of a psychopath: a personality type defined by a lack of care for others, a lack of empathy, violent and aggressive tendencies, shallow emotions, selfishness, dishonesty, overconfidence in themselves, and the ability to manipulate people. These types of people often exhibit behavioral traits known as the Dark Triad, a trio of narcissism, Machiavellianism, and psychopathy. Some 25% of male inmates in the federal corrections system fit this description, but many psychopaths are often high-functioning people who often make their way into positions of power, such as CEO's, lawyers, media personalities, sales people, police officers and religious clergy. Knowing when you're face to face with a genuine psychopath is easy if you know what to look for. When people speak, we use conscious and unconscious words (such as 'to,' 'the', 'uh' and, 'um'), and we choose verb tenses which indicate how we think.