33 CFR 6.04-8: -8 Possession and control of vessels.

The Captain of the Port may supervise and control the movement of any vessel and shall take full or partial possession or control of any vessel or any part thereof, within the territorial waters of the United States under the Captain of the Port's jurisdiction, whenever it appears to the Captain of the Port that such action is necessary in order to secure such vessel from damage or injury, including damage to any data, information, network, program, system, or other digital infrastructure thereon or therein, or to prevent damage or injury to any vessel or waterfront facility or waters of the United States, or to secure the observance of rights and obligations of the United States.