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This is a workplace violation/disability discrimination claim. You can (should) speak with an employment law attorney about this matter. As a handicap license plate/placard holder you have every right to use that spot. You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).
For information on Handicap parking codes in GA, see: http://law.onecle.com/georgia/40/40-6-226.html