What law governs crimes such as kidnapping or bank robbery?

The correct response pertains to the nature of the crimes mentioned—kidnapping and bank robbery, which are serious offenses typically governed by laws at the federal level. Federal law comes into play especially when these crimes cross state lines or involve federal institutions, such as a bank regulated by federal authorities.

Federal law is designed to address offenses that have a broader impact, such as those that might affect interstate commerce or public safety on a national level. For instance, bank robbery is prosecuted under federal law because banks are often insured by the federal government, making the crime significant beyond state jurisdiction. Moreover, kidnapping can also fall under federal jurisdiction when it involves taking a person across state lines or if it affects interstate commerce in any way.

In contrast, while state law does govern many criminal activities, state statutes might not adequately cover offenses that have critical federal implications. Civil law addresses disputes between individuals or entities, rather than criminal matters, and traffic law pertains specifically to violations of transportation regulations. Therefore, the emphasis on federal law is appropriate due to the nature and seriousness of the crimes in question.