Any player who has used steroids, past or present, in any sport should be voidable at the sole discretion of the club that has the contract.  Here's why.

When you hire an employee to work for you, you base that salary partly on past performance with this knowledge forming the basis for predicted future performance on which the contract is constructed.

For example, let's say I would pay a banker $200,000 for certain qualifications I will call G, $150,000 for qualifications I will call H, $100,000 for qualifications I will call J, and $75,000 for qualifications I will call K.

Banker comes to me and his resume looks like Mr.  G.  I check it out and all the numbers say he's a G.  I hire him for $200,000 a year for three years.  Later on I find out that Mr. G was actually only as qualified as Mr. H.  Had I known, I'd have hired him for $100,000 a year for three years.  I'm overpaying $100,000 a year for 3 years.

Alex Rodriguez's salary was 10 years, 275 million.  But that salary was given to him based on numbers that were fraudulent.  Had Alex Rodriguez remained clean and played fair the entire time, would he have gotten this contract?  The answer is absolutely not.  Maybe he would have gotten 7 years and 100 million, maybe more.

The point is that Rodriguez defrauded the Yankees into inducing them to sign a contract based on false premises.  The Yankees should have the right to void that contract.