A lawyer for the Obama administration argued last week that law enforcement could use GPS devices to secretly track people 24 hours a day for days at a time on public streets without a warrant.  Deputy Solicitor General Michael R. Dreeben told the Supreme Court that while today GPS devices can be portrayed as an Orwellian “1984 type invasion” people’s expectation of privacy might change as use of the device becomes more common. That concerned Justice Elena Kagan:

Listen here for her comments on the issue.