All weekly and monthly tickets have always required a id card. Section 36
http://www.railusers.ie/resources/IE...riage_2004.pdf
You are liable to pay the single fare for the journey if caught or may be fined.
Curiously the ticket vending machine doesn't require you to punch the code in on the screen like it does for student tickets
3 and 7 day point to point tickets do not require a id card
Id cards available in person Dublin Bus on O'Connell Street