Louisiana first enacted miscegenation statutes in 1807. These statutes prohibited (what they termed as) "Negroes" from marrying whites or Indians. Some of the penalties for doing so were:
Rendering the marriage "Null and Void"
Up to 5 years of hard labor for white-black marriage attempts
The statutes were repealed in 1972 (yes, I said 1972) but it seems that Keith Bardwell, justice of the peace in Tangipahoa Parish, never received that memo.
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Read more at: http://www.huffingtonpost.com/2009/10/15/interracial-couple-denied_n_322784.html
Statistical source: Virginia Hasn't Always Been for Lovers by Phyl Newbeck