One day, a child will die because we can't read the minds of criminals. Oh wait... Privacy is privacy. Whether the information is in someone's head or on their phone, if you can't compel people to reveal what they don't wish to reveal, there's not much (legally) that can be done about it. That's what they wish to change... people's right to privacy. Why not just say that then? Oh right. Because then it would be clear why it's not ethical.
11/20/14 at 3:12pm