Check out this report at Lawyers.com about a privacy case, to be heard 
by the Supreme Court, involving the legitimacy of police bypassing warrants when using GPS tracking and whether it is constitutional considering how easily police can obtain warrants and how much information is available through tracking.
The argument is about whether it infringes on the purposes of the First, Fourth, or Fourteenth Amendments. I think the outcome may well be significant.
What are your opinions?