I think it must be the same liquied I told about a year or two back - not much interest as far as I remember.
As far as I recall, the dealer has a number registrated by the police, and when the pilice find anything with that number, they contact the dealer, and he will know who the customer is. I seem to remember that it is used in the UK and in some Scandinavian countries.
The thing is, that thiefs cant see the number, and they no doubt have no time to use an UW light, so when the police finds a lot of items - not belonging to the thieves - they can use UW light to find out from where the items come.
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