At the heart of Western thinking is the notion that the individual, rather than the group, is the fundamental moral and ethical unit. Companies have rights accorded them by law, systems have functions, but individuals have the responsibility to determine right from wrong.
Since systems are really only groups of people tasked to do certain things in certain ways, they can be subverted. And, while individuals across firms can be networked together and told to be watchful, they will only be as effective as they are good.
For a system to work, it must be made up of the right raw material, which in this case is people who are moral, ethical and have nothing to hide. It must be made up of people with high levels of integrity.