...in August 2002, and it's archived at
http://www.democraticunderground.com/cgi-bin/duforum/duboard.cgi?az=show_thread&om=1922&forum=DCForumID60One puzzling and apparently misunderstood feature of the system for requesting and getting FISA warrants is the WITHDRAWAL of FISA warrant requests by supervisors at FBI headquarters. Many press reports repeat the assertion that "no FISA warrant request ever has been denied." The FISA annual report to Congress for 2001 even says this, despite what we all know about Colleen Rowley's request.
The explanation for the discrepancy was the interposition of James Baker IV and other members of DOJ's OIPR between FBI field agents and the FISA court. OIPR stands for "Office of Intelligence Policy and Review". This office has the power to 'withdraw' FISA warrant applications on behalf of the field agents who requested them.
"... The surveillance request procedure usually took the form of a three or four page document known as a "letterhead." It was signed by the FBI assistant director for national security. ..."
The warrant issuance process allows for 'Withdrawal' of requests before a final 'yes' or 'no' decision is made. Thus warrants frequently may in practice be denied without officially being 'Denied'.