[praptak]

The (untested) theory behind canaries is that they can forbid you from speaking the truth but they cannot order you to tell a lie.

So you don't leave a canary in place, it just expires and you don't put up a new one.

[mapt]

You talk about warrant canaries being an untested legal theory; I say this is putting the cart before the horse.

When were National Security Letters with gag orders prohibiting disclosure tested for constitutionality, in cases when the gag orders are violated and the government wants to punish somebody for disclosure?