Obviously I can't prove the nonexistence of secret proceedings where people have been made to lie to the public. This is ever the domain of conspiracy theorists, because you can never really prove that no such thing has happened, to say nothing of proving it won't. Proving non-existence in general is a nearly impossible problem in the real world. But I think it's unlikely. People can feel free to let their irrational fears dominate their behavior if they want.
