twototwenty has correctly protected harryk. (Since you already have 5 accusations, pick one of the remaining officers to give your extra accusation to.)
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As The Architect realized (good thing the rest of you had him to bail you out), the clue was indeed a reference to the 1971 Western Dirty Harry, starring Clint Eastwood. That clue was meant to be relatively easy... I definitely did not expect none of you to have heard that quote, since it's among the most famous movie lines ever.
The entire quote, for reference: "I know what you're thinking. "Did he fire six shots or only five?" Well, to tell you the truth, in all this excitement I kind of lost track myself. But being as this is a .44 Magnum, the most powerful handgun in the world, and would blow your head clean off, you've got to ask yourself one question: Do I feel lucky? Well, do ya, punk?"
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Your next clue:

Alone. The third. Not very sure...
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In addition, I encourage the officers to use some accusations... at least one or two, since otherwise this game will probably drag on for a very long time.