This would be pretty easy to test. Just get a bunch of friends to start exchanging encrypted messages about bombing an embassy or govt office. If these douche-bags can break it, they'd be on you like white on rice.
can anyone think of a lower risk way to test...?
Someone in Germany sending encrypted messages to go walking near a secret US military facility and try taking photos of NSA spies in their natural habitat should do the trick. It's not enough to lock you up but enough to lift you out of your bed to ask you some questions.