There's an easy canary in this cases. I don't know how FBI/NSA notifications are received in the US. But you can communicate to your uses any FBI/NSA/LE notifi

There's an easy canary in this cases. I don't know how FBI/NSA notifications are received in the US. But you can communicate to your uses any FBI/NSA/LE notification before reading the content. Of course, the notification should be posted to a medium where you don't have further control over, so there's no way for you to remove the notification.