Bottles and cans bought in Leinster House aren't coming with a 15 to 25 cent deposit on them.
It comes as Minister Ossian Smyth has been campaigning to get a reverse vending machine installed.
It's understood that tills at the canteens and shops on the campus have been set up to apply the deposit, but the green light to charge it, hasn't been given.
Louise Burne, Political Correspondent with the Irish Mirror, says it opens a loophole to the system.
"My understanding is that even if you don't pay the deposit on the cans or the bottles that you buy in Leinster House, you can actually take the can or the bottle, if it has a logo, and bring it to a vending machine or something else elsewhere to get your money back."