It is unclear exactly how many law enforcement agencies are currently using this capability but it is reasonable to say that while resource limitations used to discourage the government from tracking you without a good reason these constraints have largely disappeared.
Above all we should not forget that government is an evil a usurpation upon the private judgement and individual conscience of mankind.
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A graduation ceremony is an event where the commencement speaker tells thousands of students dressed in identical caps and gowns that 'individuality' is the key to success.