WASHINGTON - Former employees of financial firms who have already pleaded guilty to rigging muni bond contracts will be allowed to testify in the upcoming bid-rigging trial against former UBS Financial Services Inc. bankers Peter Ghavami, Gary Heinz and Michael Welty, a judge ruled Tuesday.

The order by District Judge Kimba Wood allows prosecutors to call to the stand witnesses who they say can explain the meaning of "code words" the men used in recorded telephone conversations in 2001 and 2002.

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