cause. Compare. The Marianna Flora, 11 Wheat. 1, 42. In the case at bar, there was probable cause to believe that our revenue laws were being violated by an American vessel and the persons thereon, in such manner as to render the vessel subject to forfeiture. Under such circumstances, search and seizure of the vessel, and arrest of the persons thereon, by the Coast Guard on the high seas is lawful, as like search and seizure, of an automobile, and arrest of the persons therein, by - prohibition officers on land is lawful. Compare Carroll v. United States, 267 U. S. 132, 149. As the Coast Guard was authorized to seize the motor boat, the search of her by the deputy surveyor within the territory of the United States was, in any event, authorized under § 581 of the Tariff Act of 1922. The failure of the Government to institute thereafter proceedings for forfeiture of the motor boat and the liquor did not, by retroaction, render illegal either the seizure or the search.
Moreover search, if any, of the motor boat at sea did not violate the Constitution, for it was made by the boatswain as an incident of a lawful arrest. Agnello v. United States, 269 U. S. 20, 30. But no search on the high seas is shown. The testimony of the boatswain shows that he used a searchlight. It is not shown that there was any exploration below decks or under hatches. For aught that appears, the cases of liquor were on deck and, like the defendants, were discovered before the motor boat was boarded. Such use of a searchlight is comparable to the use of a marine glass or a field glass. It is not prohibited by the Constitution. Compare Hester v. United States, 265 U. S. 57. A later trespass by the officers, if any, did not render inadmissible in evidence knowledge legally, obtained. McGuire v. United States, 273 U. S. 95.
Reversed.