The headline and theme of "trying to make their contracts non-guaranteed" is a bit misleading. This is more a cover your backside situation in my opinion. But it is interesting to me that the Cubs seem to have set a new standard for fighting PED use and age fraud through player contract language. If you were a PED user, and you had a choice between signing a theoretically non-guaranteed deal with the Cubs (if you were caught), wouldn't you look to sign elsewhere? I think this is actually a good thing for the Cubs to do, even if the enforceability of the clauses is uncertain and even if it costs us a big name FA who isn't clean and chooses another offer because of the clause. It doesn't guarantee the Cubs are a clean team, but it does protect then from an A-Rod situation.