"If you tell the truth, you have nothing to fear": do you believe this?

Related cliches and stock movie dialogue, often cueing uh-oh music:

“If you have nothing to hide, you have nothing to fear.”
“If you’re innocent, you have nothing to fear.”

Do you think these assurances are true? Have they ever been true? Would you ever trust them?

Or do you think there’s always something to fear?

 
Tags, as I wrote them: truth, consequences, fear, trust, testimony, guilt, innocence.