In November 2009, GINA, the Genetic Information Nondiscrimination Act, officially went into law, prohibiting employment discrimination based on DNA related differences. GINA is an extremely young law and a broad one at that. So, it may take some time before its repercussions manifest in the real world of workers and employers.
Here is a quick primer on what GINA is and how it may be applied.
GINA-The basics