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I also find it to be a deeply disturbing trend. Unfortunately, I do not think the current composition of the judiciary is likely to challenge the police powers of the state. Just last week, the Supreme Court held that you have no Constitutional protection against strip searches, even if you are picked up in error as was the situation that led to the case, or if it is a minor non-criminal offense. Also, keep in mind that there was a recent decision related to GPS tracking of vehicles by law enforcement personnel without a warrant. While the Court determined that it was an unconstitutional act under the 4th Amendment, the peg on which the Court hung its hat was the physical attachment of a GPS device to the subject vehicle. During oral arguments, there were musings about whether this would be true if the FBI had used data from the individuals' cell phones. Since much of this musing came from Scalia, a regular and consistent member of the conservative 5-4 majority, I would not rest conformably on the presumption that the Supreme Court will take the side of the individual in any privacy dispute involving law "enforcement".
When it comes to Congress, good luck getting anything passed that an opponent could point at and claim, "Look, my opponent favors the privacy of terrorists over the saints of law enforcement who are trying to protect the children." :-0