The interviews were said to be largely perfunctory, the kind of t-crossing that investigators would do before wrapping up.

Subpoenas have made it clear that the inquiry has gone beyond the lane closings to include possible conflicts of interest and bribery. But the United States attorney for New Jersey, Paul J. Fishman, has said little about it, beyond that any news reports purporting to say what he was doing were “most likely wrong.”

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