John O'Mahony (Mayo, Fine Gael) | Oireachtas source

What kind of tests does Revenue do when it goes onto a forecourt? Is it a visual test or does it entail taking a sample to bring back to the State Laboratory? Are all these tests merely spot-checks? For instance, does Revenue operate at the weekend or in the evening when lots of deliveries can be made at a time away from normal working hours or whatever? Mr. Moran might provide an outline in this regard.