I got carded for just being in a liquor store?

I'm 22 so it's not that I wasn't suppose to be there. I was looking for some vodka and as I walk in past the counter the clerk said can I see your ID? I have no problem showing it when I'm actually buying alcohol but can they card you for just being there? I mean I'm 6'4" so it's... show more I'm 22 so it's not that I wasn't suppose to be there. I was looking for some vodka and as I walk in past the counter the clerk said can I see your ID? I have no problem showing it when I'm actually buying alcohol but can they card you for just being there? I mean I'm 6'4" so it's not like I'm some little kid. I'm not mad just curious if that's standard.
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