[FakeRemore]

> As far as the Facebook team knew, Tails developers were not aware of the flaw, despite removing the affected code. One of the former Facebook employees who worked on this project said the plan was to eventually report the zero-day flaw to Tails, but they realized there was no need to because the code was naturally patched out. "

So there's no way for anybody to verify that the code is actually being removed, or that the exploit won't crop up again in the future. I don't trust them or the FBI at all in this.