Al Pacino or Robert De Niro as Dave Kujan

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The part of Dave Kujan was first offered to Robert de niro who turned it down. Then to christopher walken who also did the same. Finally it was offered to Al Pacino who really liked the part but was forced to turn it down because of scheduling conflicts. He has since then mentioned that this is the film he regrets turning down the most. I wonder how it would have been in any of them had played the role of Dave. I would really have liked to see Al Pacino play the police officer {Remember heat ? }