I'm confused by the "systemic weakness" exception for the third case. Obviously I need to research this, but it seems that in many cases, a backdoor is, almost

I'm confused by the "systemic weakness" exception for the third case. Obviously I need to research this, but it seems that in many cases, a backdoor is, almost by definition, a systemic weakness. Of course, I wouldn't want to argue that point in front of a judge, but it would be useful to have more clarity around this.