By David M Buckley
March - April 2015 (click here for normal version)

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"If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle."
- Sun Tzu, The Art of War

Although investigators are not trying to destroy an enemy or engage in military action investigators are often engaged in a type of psychological battle with a subject who has information they perceive as incriminating but are reluctant to surrender that information.