All hands — and security cameras — on deck for MGM...

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The more than 300,000 people who have entered MGM National Harbor since it opened Dec. 8 have taken away casino winnings (or empty wallets), high-end clothing purchases, fancy pastries and new memories. What they have left behind: their faces. Behind the towering lobby, sparkling decor and $1.4 billion of other accoutrements is a sophisticated German security camera system that takes a high-def picture of everyone that walks through the resort’s entry points. As MGM gears up for its first New Years'…