No offence, but if your not going to fire people when you find their password written down then there going to write their password down. Written policies are practically irrelevant it's enforced policies people pay attention to.

One example of security. Someone (A) giving a breafing has someone (B) grabs at it so they can read the document. At which point (A) pulls his sidearm and threatens (B). Later (A) is given an intense debriefing to verify that he was willing to shoot (B) and simply wanted to clarify the situation vs being unwilling to shoot (B). (B) was later told he was lucky not to have been shot.