Dublin Police Act, 1842

The police shall have the power of constables upon the river Liffey, &c.; and may take into custody any person who, to prevent discovery, shall wilfully let fall any articles into the river or harbour of Kingstown.

19. Every officer and constable belonging to the Dublin police shall have all the powers and privileges of a constable upon the river Liffey within or adjoining to the said district, or the several counties of Dublin, Kildare, and Wicklow, and in and on the harbour of Dublin and harbour of Kingstown, and the docks or creeks adjacent thereto; and it shall be lawful for any such constable to take into custody every person who, for the purpose of preventing the seizure or discovery of any materials, furniture, stores, or merchandize belonging to or having been part of the cargo of any ship, boat, or vessel lying in the river Liffey, harbour of Dublin, or harbour of Kingstown, or the docks or creeks, adjacent thereto respectively, or of any other articles unlawfully obtained from any such ship, boat, or vessel, shall wilfully let fall or throw into the said river, or any of the said docks or creeks, or in any other manner convey away from any ship, boat, or vessel, wharf, quay, or landing place, any such article, or who shall be accessory to any such offence, and also to seize and detain any boat in which such person shall be found, or out of which any article shall be so let fall, thrown, or conveyed away; and every such person shall be deemed guilty of a misdemeanor.