A criminal gambling trial is set to start August 20th here in Las Vegas. This is a case where two guys figured out a way to make a video poker machine pay out more than was deserved through a software bug. The exploit didn't involve any cheating device or illegal entry into the machine. They just figured out a way to make the machine do what they wanted by using the machine's regular player interface. http://www.wired.com/threatlevel/2013/05/game-king/ They were originally charged with two counts of hacking and one count of wire fraud, all filed in federal court. The DOJ reviewed the case and found that hacking charges should be dropped. They will still face trial for wire fraud. The question here is whether a player can lawfully exploit a gambling machine's software bugs by using only the machine's human interface controls that he is otherwise authorized to use.