I agree that it's a pain in the bottom, but before you opt out you might want to consider that in our Constitutional Republic the jury weilds the ultimate power. Under the Constitution a juror has the power to effectively veto bad laws. Read more about it here...
I recently read an article, "Steroids: Are You at Risk"", by Dharkam on Meso-Rx that suggests it's dependent on the gene that orders the production of androgen receptors. The gene is polymorphic and can contain various numbers of CAG (Cytosine Adenine Guanine) repeats ranging from 6 to 39...