It wasn't but its the unintended consequence that should be at the top of the list to watch out for when considering how the law should deal with tracking. It seems disturbingly possible.
Drug dogs. Let's deal with that problem first, OK? Because we appear to have outsourced the 4th Amendment to dogs. I have a dog. My dog's jurisprudential capabilities are highly suspect.
http://www.supremecourt.gov/oral_arguments/argument_transcri...