The possibility of multiple charges originates with US federal law and state law and rules of criminal procedure. Every crime can be broken down into any number of steps or be accompanied by other crimes. For example, bank robbery is a crime; however,if one used a stolen gun to commit the robbery, then that is an included charge. If one obtained the stolen gun by breaking and entering, then that is also an included charge. If one kills someone with a motor vehicle while intoxicated, that is usually charged as manslaughter. However, an included charge will probably be assault with a deadly weapon. If the drunk driver had a child in the car at the time, then an included charge could be child endangerment.