Certainly the batteries, initially, became part of the dangerous goods system through other chemistries of batteries that, prior to the 1990s, were not nearly as dangerous in transportation. When lithium batteries came on the scene, they were added to these provisions. The difficulty becomes that if you regulate the batteries, then any time somebody ships a spare battery for a cellphone or a computer, they become a dangerous goods shipper. That presents a lot of difficulties in transportation.
Having said that, the way the dangerous goods regulations are structured, it looks at the individual battery and says a consumer-sized battery is therefore exempted from the regulations to allow that person to ship a battery. But once that battery is accepted, there is nothing in the regulations that prevents consolidations of those shipments, so we have thousands and thousands of batteries that individually do not represent a great risk to the aircraft, but when taken together, they do. Unless we regulate those batteries, there's no way for the operator to know.