Test or ANY other pharmaceutical substance expiring does NOT mean that they are useless and went bad. That's absurd. Here is what really happens.
Remeber that it's all sterile for the injectables. The date of expiry means the ammount of time for the compound to loose 5% of it's active ingredients function. Then it's a rate of decay of 2.5% loss annually after that. This is STRAIGHT FROM THE PHARMAICIST.