What falls under both federal and state jurisdiction?

Certain areas of law fall under both federal and state jurisdiction, including criminal law, environmental regulation, and family law. This means that both federal and state governments can enact and enforce laws in these areas. For instance, while states can prosecute crimes, federal authorities can also intervene in cases that cross state lines or involve federal statutes. Additionally, both levels of government can regulate aspects of the environment, leading to overlapping laws and regulations.