Automakers are warning that "smart" air bags required starting next year are, in effect, so dumb they could kill or injure children and fail to protect adults in crashes, according to USA Today. At least three suppliers have pulled smart-bag technology off the market for more development. One of them, Siemens, says it doesn't have any system that can't be fooled if an occupant shifts around in the seat or a child is in a heavy child seat, and doubts whether anyone else does. "Any (smart) system can be compromised," says Siemens' David Ladd. Automakers are scrambling to find new suppliers, but doubt that the few remaining can make enough foolproof smart systems. As a result, what are billed as safety devices could be harmful, according to USA Today.