(Bloomberg) -- Bradley Birkenfeld, the former UBS Group banker who won a $104 million whistle-blower award after serving time in prison for tax conspiracy, won a U.S. judge’s permission to testify in France in a separate probe of the Swiss bank.

U.S. District Judge William Zloch ruled Tuesday that Birkenfeld can travel to Paris to testify before French judge Guillaume Daieff on Feb. 27. Daieff is leading investigative judges probing whether UBS, the largest Swiss bank, engaged in laundering the proceeds of tax fraud.

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