McCain's Plan to Rearrange the Hall of Fame

A Guardian article on McCain’s new proposal to implement a uniform drug testing regime in professional sports (read: baseball) contains the following teaser:

The new Senate proposal has a provision urging leagues to erase records achieved with the help of performance-enhancing drugs.

It’s hard to argue against stripping records from players on steroids, but I wonder how it could be enforced against players like McGwire and Bonds, whose steroid usage is common knowledge but has never been proven. How would this rule be written – "Records will hereby be stripped from any player whose neck is wider than home plate"?