When board oversight strays, so do companies, and if board oversight doesn’t exist, well, that can lead to an $8 billion fraud. Protiviti’s Jim DeLoach continues his series on governance failures with three more examples that provide lessons in sound business decision-making. Last month, I identified lessons from two corporate governance failures resulting in the demise of two companies — Blockbuster and Washington Mutual — and one involving an audacious fraud in another company, Theranos.