Did you estimate an overall number of arrests, in order to determine where people would be sent and whether there would be enough room for everyone, in the event of mass arrests? Did you have a plan in place? If so, how much money did you spend on it? You had protection plans in place, but did you have a budget for arrests? Did you have a planned location, and did you make certain that it would be accessible and safe for everyone? Did you have a plan to ensure the well-being of the people in custody, or was your only concern the safety of the twenty G20 leaders and eight G8 leaders?
Those events are still costing taxpayers money, because there are still court cases pending. Those costs may not be clear today, but they certainly will be at some point in the future.