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Oil. >> reporter: the unmistakable scent of oil remains. >> you see science. sometimes we have to search. but this is definitely tainted with oil. >> reporter: despite the strength of that scent. the see cosystem is largely recovered. the marshes have bounced back, but there are long-term ramifications. the shellfish beds are still closed so that had a significant business effect. it speaks to the long road ahead for gulf coast residents. megyn: a new manhunt for the teen final tough known as th...