Maritime Safety Act 2005
Drunkenness, etc., of passengers or members of crew.
29.—(1) (a) The person in command or in charge of a vessel may—
(i) refuse to permit to board the vessel a person who, in the opinion of the person in command or in charge, is, by reason of being under the influence of alcohol or a drug or any combination of drugs or drugs and alcohol, in such a condition or misconducts himself or herself in such a manner, as to cause injury or serious offence or annoyance to persons on the vessel, to cause damage to the vessel or to obstruct, impede or molest a member of the crew of the vessel, or
(ii) put such a person ashore at any convenient place.
(b) A person who, under paragraph (a), has been refused permission to board, or been put ashore from, a vessel shall not be entitled to be repaid any fare paid by him or her in respect of any voyage or excursion to which his or her attempted boarding of, or presence on, the vessel related.
(2) If a person in command or in charge or another member of the crew of a vessel is, while on duty, under the influence of alcohol or a drug or any combination of drugs or drugs and alcohol to such an extent that his or her ability to discharge his or her duties is impaired, he or she is guilty of an offence and liable on summary conviction to a fine not exceeding €5,000.