Tufts University physicist Roger Tobin is about to publish a paper in the journal American Journal of Physics titled "On the potential of a chemical Bonds: Possible effects of steroids on home run production in baseball" (I wonder if that "chemical Bonds" was a pun?)
A change of only a few percent in the average speed of the batted ball, which can reasonably be expected from steroid use, is enough to increase home run production by at least 50 percent," he says. This disproportionate effect arises because home runs are relatively rare events that occur on the "tail of the range distribution" of batted balls.
I wonder if this should be added to our collective knowledge on the Physics of Baseball? :)