Precedents?
This is the best they've got...
Some 950-year-old laws imposed on England by the Norman conquerors.
Some 700-year-old decrees of Edward I, a notorious tyrant.
And some unconstitutional 20th-century government excesses which gave law enforcement access to private financial transaction records and similar paperwork, which, they argue, should also apply to electronic devices that are constantly recording the minutiae of our lives (often out of context).