Thought of the Day: Is Fraud Inevitable?

I get incredibly frustrated when I read stories like this one about Richard Lopez Razo, who first as a contractor, and then as a State Department employee, took tens of thousands of dollars to facilitate Iraq reconstruction projects. Maybe it's a sign of resignation, but rather than wondering about his motivations, or decrying committing fraud on behalf of Iraqis, I'm just wondering if any level of oversight can completely prevent fraud when this amount of money is involved. It just seems like the dollars are too big, and in the aggregate, humans are just too weak, for it never to happen.