'Drops our present guard nodes and picks a new set.
.. versionadded:: 1.2.0
:raises: :class:`stem.ControllerError` if Tor couldn\'t fulfill the request'

def drop_guards(self):

    if (self.get_version() < stem.version.Requirement.DROPGUARDS):
        raise stem.UnsatisfiableRequest(message=('DROPGUARDS    was    added    in    tor    version    %s' % stem.version.Requirement.DROPGUARDS))
    self.msg('DROPGUARDS')
