The use of wiretaps and recordings of conversations to help underpin the insider trading case against the Galleon Group hedge fund struck legal experts as unusual, for an investigation involving the Securities and Exchange Commission.

“It is unusual,’’ said Robert S. Khuzami, the director of enforcement at the SEC, at a discussion of hedge fund regulation at the Practising Law Institute in New York. But, a year from now, “I hope it’s more common.’’

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