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washing up in the marshes near the mouth of the mississippi river and government scientists say a small portion has reached the so-called loop current which could take it to florida and up the east coast. kelly cobiella has the latest tonight from venice, louisiana. this is devastating. reporter: this is louisiana s nightmare: heavy black oil killing the grasses that make up these vital marshes. this is the monster that we re fighting. it s like a serial killer. it s just tough to track. reporter: p.j. hahn is the director of coastal management for plaquemines parish. he s seen the oil pop up virtually overnight in pockets like this. we have a whole series of booms booms that come out here off the barrier islands. how s it getting in here? it s coming out under the booms. reporter: the oil in the marsh is thick, it s black, it almost feels like molasses in your hands. it sticks. it s been in this marsh for only about 24 hours, it s already made its way all t ....