Myself and a group of 7 other people were away for a family weekend recently where we stayed on the grounds of a hotel in three of their lodges. As we all had a (good) few drinks in the hotel after our meal, no one wanted to drive back to the lodges (about 1/4 mile) and instead we opted to walk. However the subject arose as to whether the gardai can come on to private property and breathalyse you? The common opinion was that they cannot, but I would be interested to know the correct answer. I could have saved myself a long walk!