Roger played baseball. If he took steroids, he violated a private agreement with his boss. Not a crime.
He told Congressman Waxman's nosy committee he didn't take steroids. Congressman Waxman disagreed, and Roger is about to go to trial for lying to Congress, a crime that could send him to federal prison for 30 years.
Please do not let this confuse you about federal law. Lying to Congress is felony. Lying in Congress is a hallowed American tradition.
Even if he did take muscle juice, all Mr.Clemon's had to do was first get elected, Then he and his congressional collagues could have rubbed Pinocchio noses to their hearts' content.