The title pretty much sums up the story, but I also think that the culprit could very well be dave (aka The Earl of Sandwich).

Police say a man used what they call a “gun-shaped” object in his attempt to rob a Humboldt Park bar Monday night. But a tipster tells CBS 2 the weapon was actually a ham sandwich molded into the shape of a gun. The ham-robber fell on his way out of the bar and was arrested.

I wonder if the "tipster" ate the evidence.