Passports are invalid forms of ID now?

I know some ID laws vary from state to state, so for clarification, I work in a Tennessee store. To my knowledge, there's been no change to the laws about passports counting as federal ID here. Yesterday, we were able to take them. Today, we're not. What gives? Is this happening at other stores? Does anyone know why?

I think it's bordering into an ethics problem at some point, considering medicines (cold and blood pressure medicines) are age restricted.