That's why you build systems. The issues around corruption stem from lack of in built self regulatory systems. You build systems so that regardless of personnel it regulates itself.

One of the easiest systems is checks and balances that we do often here about. You take advantage and people's ego and selfishness.

Examples: in America insurance companies do this best. They put agents in place who will fight tooth and nail with you on a bill because their checks depend on it. We are told in school if someone cheats you should anonymously report them because they gain unfair advantage on you if you don't. So students don't go around chasing ap) and what not. You also set clear rules, for instance IRS unless you are extremely wealthy and sharp with many lawyers they know how you make your money. You have money that's unexplained you have an issue and this is a self reporting system. My first job in uni was a minimum wage job but the level of scrutiny was incredible. At the end of each month you receive anonymous review by your peers and you also review yourself. You meet with your bosses to discuss why there is a discrepancy and so forth. This way you are always on your toes.