This amounts to the "you can't handle the truth!" argument. It may be true that the average citizen, and thus the average jury member, is unaware of what ethica

This amounts to the "you can't handle the truth!" argument. It may be true that the average citizen, and thus the average jury member, is unaware of what ethically-conducted police work looks like. But that doesn't seem to constitute an argument that keeping everyone in the dark about what average police work looks like is an overall good thing.