A Slip of the Tongue is a Traffic case in L.A. Noire. It was a pre-order bonus from Wal-Mart in Canada and the US and Play in the UK. According to Play.com, it came with the game soundtrack. JB Hi Fi Australia and New Zealand also have this case exclusive to JB Hi Fi pre-orders. It is now a story case in the The Complete Edition of the game.
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M - Mature