So after "109 messages with an overseas terrorist" which they can't decrypt, they don't bother to place that suspect under immediate surveillance? So we're sup

So after "109 messages with an overseas terrorist" which they can't decrypt, they don't bother to place that suspect under immediate surveillance? So we're supposed to believe that this happens every day, their systems detect it, but because they don't know the contents of the messages they're unable to do anything... Sounds to me like they should be working on their meta-data collection.