Most of the world runs of on good faith and best intentions, without it everything would break down. This goes for taxes, healthcare, insurance, checks, postal mail, traffic code, currency, etc.

This also holds for an alarming number of electronic systems such as the phone network, and many ISP network configurations. While it's tempting to say no trust should be required, that's very expensive, like bitcoin.

For system to be cost effective, trust is necessary. Requiring self-control is cheap and often effective, because people want to abide by the law. Requiring submission of soil samples is rather expensive, and fairly strong control, because cheating is a very deliberate act.

We probably have to ask, how can we improve the trust? Higher morals and more transparency could be one answer.