Power to board vessel

(1) Any police officer may enter on board any vessel in any harbour, bay, roadstead or river, and may remain on board any such vessel for such reasonable time as he thinks expedient, and if he has reasonable ground to suspect that there is on board of any such vessel anything stolen or unlawfully obtained, it shall be lawful for him to search, with any assistants, any and every part of the vessel, and, after demand and refusal of the keys, to break open any receptacle, and, upon discovery of anything which he may reasonably suspect to have been stolen or unlawfully obtained, to take such thing and the person in whose possession it is found before a magistrate to be dealt with as hereinbefore provided. (2) Any such police officer may pursue and detain any person in the act of conveying any such thing away from any such vessel, whether he has landed or not, together with anything so conveyed away or found in his possession.