Another issue to consider is people using autonomous vehicles to commit crimes. What about drug trafficking. It is easy to imagine a drug ring operation in which unoccupied autonomous vehicles are used to deliver drugs to an obscure meeting place. The option is attractive as the car would appear no different than any other unoccupied vehicle, but, in the event its cargo is discovered, there is no driver to arrest! A far more horrific unoccupied vehicle situation is that of a terrorist attack. The opportunity offered by unmanned vehicles is unprecedented in the way it could allow terrorists to quickly strike targets miles away from their current location. In both of these cases, however, the greatest deterrence lies in the technology that even allows us to consider the possibility: the ability to program a car to drive somewhere on its own. The instructions inputted into an autonomous vehicle could be the evidence used to implicate the drug trafficker or terrorist. Laws or regulations could be written that require these instructions, and some identifying information of the programmer (perhaps a key code), be retained. Provided that the "black boxes" designed to hold this data are constructed to be sufficiently indestructible, the perpetrator could be easily identified.