Because YOU (assuming you are actually the pharmacist) are the one responsible for the final check. Not the "CVS system." If YOU are approving medication this way, then YOU are at fault. Period. I'm not familiar with the CVS system, but every other pharmacy system I've worked with, has the ability to go in and change the expiration date so it prints correctly on the label. I would be highly surprised if the CVS system did not also have this ability. And if you told me it didn't, I would be as disbelieving as if you told me the CVS system can't adjudicate to insurances. I mean, really? If YOU as the pharmacist don't make sure your techs follow proper protocol can change the expiration date in the computer, when a drug is short-dated, then YOU have no legal leg to stand on threatening lawsuits.