Yes must be valid. No copies and must be at least 21.
Yes. As long as you can provide a physical [No, you cannot show a copy or a photograph from your phone] and valid [It cannot be expired] official identification document with a photo and your birthdate showing you are 21 years old or older, you will be allowed entry and be able to make a purchase. This can be any driver's license, State ID, passport, military ID, or any equivalent document from your state or country of residence.
Not sure about Indiana specifically but my BF got in with MD ID if that helps any
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