What legal authority does the United States enforce from 3NM to internal waters?

The correct choice pertains to the legal authority the United States exercises in its maritime jurisdiction from 3 nautical miles (NM) to internal waters, specifically under 21 U.S.C. § 844, which addresses drug-related offenses. This statute enables the enforcement of U.S. drug laws within this critical zone, allowing for the prosecution of drug trafficking and related crimes that occur in this area. This jurisdiction is essential for maintaining order and safety in U.S. waters, particularly as it pertains to combating illegal drug activity.

The other options do not specifically govern the enforcement of laws from 3NM to internal waters. The United Nations Maritime Law pertains to international agreements on maritime conduct, while the Coast Guard Enforcement Act may reference broader authorities but not necessarily at that specific legal scope. Foreign Vessel Regulations relate to the operation and conduct of foreign vessels in U.S. waters but do not focus specifically on enforcement of U.S. law regarding drug offenses. Thus, the authority derived from 21 U.S.C. § 844 stands out as the relevant legal framework for the enforcement of such laws in that defined maritime boundary.