[001sky]

Perhaps the scariest thing is their plan to collect and store all data on all of your activities, then retroactively mine it

This is the biggest grey area/ major issue. The issue is not just 4th amendment stuff (reasonable expectations of privacy), but selective disclosure and prosecution (ie, equal protection). The use of this for blackmail would be come ~irresistable to those seeking to cling to power. And this kind of stuff is why the bill of rights exists.

[nickff]

The problem is that the selective disclosure and prosecution are very easy to abuse without violating the text of the constitution; especially when the average American commits three imprison-able offences per day, because of the number of criminal laws, and their breadth.[1]

[1] http://online.wsj.com/news/articles/SB1000142405274870447150...