The people who should be the ones to benefit are the Costa brothers, since they were apparently able to prove the supplements were tainted since they still had them and they were tested and proven to be tainted in the labs.
I suggest such a policy causes more problems than it solves. Riders must be held responsible for everything they ingest. If they want to risk eating food that they don't know is organic then that is the risk they take - no crying "I didn't know" afterwards.
If you have "outs" or even leniency then the system evolves into one in which the creation of alibis becomes an integral part of it.