In the United States v. Abel Turner, the Supreme Court was tasked with determining whether a state court had jurisdiction to try an individual for a crime committed on board of an American vessel in international waters. The defendant argued that since he was not within any particular state's boundaries when he committed his alleged offense, no state court could have jurisdiction over him and thus his indictment should be dismissed. However, the Supreme Court disagreed and held that although Congress has exclusive authority to regulate maritime affairs outside of U.S territorial waters, it does not necessarily follow that states are without power to punish offenses occurring thereon as long as they do so consistently with federal law or policy. As such, the Court found that under certain circumstances a state may exercise criminal jurisdiction over acts done beyond its own borders but still within those of the United States at large; therefore affirming Abel Turner’s conviction by upholding the lower court’s ruling against him.

In United States v. Abel Turner, the Supreme Court was asked to decide whether a state court had jurisdiction over a case involving an alleged violation of federal law. The majority opinion held that the state court did not have jurisdiction because it lacked authority to enforce federal laws and therefore could not hear cases arising from such violations. Justice McLean dissented, arguing that Congress had given states broad powers in criminal matters and that this power extended to enforcing federal laws as well. He argued further that since Congress had granted states these powers, they should be allowed to exercise them when necessary for the protection of citizens’ rights under those laws. In conclusion, he maintained that allowing states to enforce federal laws would help ensure justice by providing another avenue for citizens who may otherwise be denied access due to lack of resources or other factors beyond their control.