So why isn't the batch checker taking on that responsibility? Doctors aren't responsible for anything and everything that happens. If they've had a drug tested

So why isn't the batch checker taking on that responsibility? Doctors aren't responsible for anything and everything that happens. If they've had a drug tested to check it's safe, after informing the patient, what else is there for them to do? You're creating a hypothetical to enforce the status quo. That's why we end up with this bs to start with.