I'll start. I don't know if there is an easy answer to that question.
I'd say that the barrier of encryption prevents us from obtaining a full picture of the evidence that is in the possession of the individual the police are investigating. I've talked to some of my tech crime people and they say you can have encryption technology today that will eventually be defeated and there will be a workaround or, though research, we'll be able to find a way, if you will a back-door way, to defeat the encryption. I think that whatever we will come up with, the bad guys will find a way or discover it in the same manner. I think what we find now is that police are simply not equipped to deal with it as effectively, in some cases, as the bad guys. That's the position we find ourselves in time and again.