The public toilets at the Natural History Museum and Heuston Station have tested positive for cocaine residue.
Fifteen bars and five public buildings in Dublin were tested with cocaine-detecting wipes.
Ten of the bars tested were found to have traces of cocaine.
Reporter Sarah Ruane said they also tested a Government Department building.
She said: "A Government Department building was the next building we tested and again we went into the toilets here using the cocaine-detection wipes.
"We got the all-clear here so no cocaine detected in our Government Department building."
The Natural History Museum. Pic via Wikipedia