Steven Sletten, a lawyer from Gibson Dunn and Crutcher, told the jury in the trial of former UBS and Citigroup trader Tom Hayes that the Swiss-based bank received three subpoenas from the U.S. Commodity Futures and Trading Commission (CFTC) regulator between April 2011 and July 2012.
The CFTC initiated an investigation into dollar Libor rates in 2008 and it was two years before this was expanded to the area in which Hayes specialised.
Hayes, a former yen derivatives trader based in Tokyo, is charged by Britain's Serious Fraud Office (SFO) with eight counts of conspiracy to defraud between Aug 2006 and Sept 2010, a criminal offence that can carry a 10-year jail sentence.
Hayes, 35, has pleaded not guilty and is due to lay out his defence later in the trial -- the first of an individual accused of Libor rigging -- which is scheduled to last into August.
Evidence and material was discovered that led authorities in other countries to start probing yen rates after the U.S. regulator investigated allegations of manipulation of the vast dollar Libor rate.
Swiss regulator FINMA, the UK regulator, Department of Justice (DoJ) criminal division, the CFTC, Securities and Exchange Committee and Japanese regulator FSA were all investigating by 2010, prosecutor Mukul Chawla said.
Sletten, called as a witness for the SFO, said his firm was appointed by UBS, which had previously instructed UK-based law firm Allen & Overy, to deal with the rapidly expanding global Libor investigation in December 2010.
During the course of the internal UBS investigation, that focussed on Jan 2005 to end-2010, Sletten said the law firm interviewed witnesses and collected 31 million documents globally in relation to 92 "custodians" including current and former UBS staff as part of an operation spanning the UK, United States, Switzerland, Japan, Hong Kong, Singapore and Australia.
In the subpoenas sent by the CFTC, which were also addressed to Sletten and shown to the jury, UBS was ordered to produce targeted searches of communications as well as documents relating to members of UBS's board of directors and executive committee and group treasury reports.
Sletten said UBS was ordered to hand over around one million of the documents to the SFO.
However, around eight million of the documents were created in or retained in Switzerland, where they had to be dealt with according to Swiss bank secrecy and privacy laws, he added.
The SFO alleges Hayes was a ringleader in a conspiracy with 25 staff from at least 10 banks and brokerages to rig Libor, the London interbank offered rate used to price an estimated $450 trillion of financial contracts and loans worldwide.
(Reporting by Kirstin Ridley; Editing by Carolyn Cohn and Keith Weir)
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