A team becomes honest when leaders stop punishing inconvenient information.

Inconvenient information gets punished in small ways, a change in tone, a slower reply, a decision that quietly costs the messenger something. Nobody calls it punishment and everyone learns from it, and a team can become dishonest without a single person choosing to lie.

Audit your own reactions rather than your policies. Think of the last three times someone brought you a problem and what happened to them afterward. That record is what your team is working from.