Why Max von Sydow was able to kill Colin Farrell in Minority Report ?

Danny Witwer(Colin Farrell)
Director Lamar Burgess(Max von Sydow)

In the movie Minority Report When someone try to kill Salomone, police comes to stop. Police can know the murder. But why that didn't happend when Director Lamar Burgess murdered a man. Why he was able to do that.
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