Follow that bottle!

Fascinating snippet in the news about a pilot scheme being run in Dundee whereby bottles of booze are "tagged" in such a way that they can be traced back to the shop that sold them.  The idea is that if an under-age drinker is found (presumably in a public place - under-age drinking in private is not an offence, or is it in Scotland?) the system can be used to determine where the drink was purchased, and then hopefully using the store's CCTV the actual purchaser can be identified, and the appropriate action taken if necessary.  All a bit Big Brother but that's the way things are going these days, isn't it?