Wired reports that the FBI issued back dated blanket subpoenas to telcos to cover their acquisition of telco records.
While I find the Patriot Act necessary, I also find its abuse repugnant.
The DOJ's IG found:
Top officials at the FBI's counter-terrorism division signed the blanket subpoenas "retroactively to justify the FBI's acquisition of data through the exigent letters or or other informal requests."
Either do it as laws and regulations allow or don't do it at all.