I have this strange rash...Maybe I will call the Federal Reserve

Here is an excerpt from an article on The Smoking Gun website about the investigation into steroid use in baseball.

After a week's cooperation, Grimsley's lawyer stopped his chats with the government team, which included Internal Revenue Service agent Jeff Novitzky, who has headed the steroid investigation of Barry Bonds and other clients of San Francisco's BALCO laboratory.

Now, why is the IRS heading investigations into drug use? Seriously, isn't that the FDA's, ATF's and/or the FBI's job. Heck, I could understand the Justice Department or as a stretch Health and Human Services taking charge, but the IRS. Do they even know how to do drug testing?