Due to the increase in fake Ch Lafite in China and elsewhere (see this article at MarketWatch.com) Ch Lafite have adopted the Prooftag security system for both Ch Lafite Rothschild and Carruades de Lafite labelled since Feb 2012.
The seal is applied to the bottle neck (at the back), partly on the capsule and partly on the glass.
It provides two levels of protection:
1. a unique -bubble code- that cannot be reproduced.
2. a 13 character alphanumeric code that is associated with the bubble code