Maybe tagged was the wrong wording, then it must be something to do with the bar code, they cannot sell you a beer as it wont go through the till, there was a farang here in Phuket who walked out of a Tops with a packet of razor blades that he had not paid for, they knew about it because they slapped his photo on the front of the shop and on the door, I knew him he live a couple of soi's down from me, what happened after that I dont know,