Dublin Police Act, 1842

Constables may apprehend without warrant disorderly persons, &c.

27. It shall be lawful for any constable belonging to the Dublin police to take into custody without a warrant all loose, idle, and disorderly persons whom he shall find disturbing the public peace, or whom he shall have good cause to suspect of having committed or being about to commit any felony, misdemeanor, or breach of the peace, and all persons whom he shall find between sunset and the hour of eight in the morning lying or loitering in any highway, yard, or other place, and not giving a satisfactory account of themselves.