All airplanes are required by law to carry a “black box” which is a highly durable recorder that keeps track of communications and engine data for recovery after a crash. Now, the National Highway Traffic Safety Administration (NHTSA) wants to require those for cars, but who gave them the authority?

The US Constitution divides the federal government up into three sections, each one with its realm of power that it is sovereign over and the others cannot interfere with or duplicate. The Legislative branch creates law, the Judicial branch interprets law, and the executive branch enforces law. These areas are separate; legally the judicial branch cannot make law and the legislative branch cannot enforce law, for example.